The ntvdm cpu has encountered an illegal instruction windows 7 что делать

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The Ntvdm CPU Has Encountered an Illegal Instruction is a commonly encountered error message on Windows systems, and it can be quite frustrating for users. With this error, the Ntvdm CPU (short for Windows NT Virtual DOS Machine) is notifying the user that it has encountered an illegal instruction, which means that a program or application running within the Ntvdm environment is attempting to execute a command that is not valid. This can happen for various reasons and may require troubleshooting to resolve.

The Ntvdm CPU was introduced in older versions of the Windows operating system to provide support for running 16-bit applications in a 32-bit environment. However, as technology has advanced and newer versions of Windows have been released, the need for the Ntvdm CPU has decreased. Despite this, some legacy applications or malware may still trigger the error message. To address this issue, users can try updating their operating system, running a malware scan, or using compatibility settings to run problematic programs. Finding a compatible or updated version of the application may also be a viable solution in some cases.

If you encounter the error message «The Ntvdm CPU Has Encountered an Illegal Instruction,» it typically means that the Ntvdm.exe process, which allows 16-bit applications to run on a 32-bit operating system, has encountered a problem. To fix this issue, you can try running the affected program in compatibility mode, updating your operating system, or disabling any virtualization software that may be interfering. If the problem persists, it may be necessary to seek assistance from a professional IT support team.

Understanding the Ntvdm CPU Error

The Ntvdm CPU has encountered an illegal instruction is an error message that can occur in Windows operating systems. Ntvdm stands for NT Virtual DOS Machine, which is responsible for running 16-bit applications on 32-bit versions of Windows. When this error occurs, it means that the Ntvdm CPU has received a command that it cannot execute properly, resulting in the application crashing or not functioning as expected.

Causes of the Ntvdm CPU Error

There can be several reasons why the Ntvdm CPU has encountered an illegal instruction error. One common cause is compatibility issues between the 16-bit application and the 32-bit operating system. Since 32-bit systems no longer fully support 16-bit applications, the Ntvdm CPU may encounter instructions that it cannot execute.

Another possible cause is corrupted or missing system files. If the necessary files for the Ntvdm CPU to function properly are damaged or deleted, it can result in the error message. Additionally, problems with hardware or device drivers can also trigger the error.

Lastly, malware infections can interfere with the Ntvdm CPU’s operations and cause it to encounter illegal instructions. Malicious software can modify system files or disrupt normal processes, leading to errors such as the one we are discussing.

Compatibility Issues with 16-bit Applications

When the Ntvdm CPU encounters an illegal instruction error, it often indicates a compatibility issue between the 16-bit application and the 32-bit operating system. This is because modern versions of Windows have gradually phased out support for 16-bit programs to focus on running 32-bit and 64-bit applications.

The Ntvdm CPU functions as a virtual machine that emulates a DOS environment to allow 16-bit applications to run on Windows. However, due to the advancements in technology and security concerns, the Ntvdm CPU may not be able to handle certain instructions that the outdated applications require.

The error typically manifests when trying to launch an older DOS-based program or game. The Ntvdm CPU receives an instruction that it cannot execute properly, resulting in the illegal instruction error message.

Corrupted or Missing System Files

An error in the Ntvdm CPU can also be caused by corrupted or missing system files. The Ntvdm CPU relies on various files and components to operate correctly, and any damage or deletion of these files can result in the illegal instruction error.

System files may become corrupted due to improper shutdowns, hardware failures, or malware infections. It is also possible for third-party software installations or updates to overwrite or delete necessary Ntvdm CPU files, leading to the error message.

To resolve this issue, users can try using the System File Checker tool, which scans system files for corruption and repairs them if necessary. Running a full system scan with reliable antivirus software can also help detect and resolve any malware-related issues.

Hardware or Device Driver Problems

The Ntvdm CPU error can also be triggered by hardware or device driver problems. Incompatibilities or malfunctions in specific hardware components or their associated drivers can interfere with the smooth operation of the Ntvdm CPU, leading to the illegal instruction error.

If you recently installed new hardware or updated a device driver, it is worth considering whether these changes are causing the issue. In such cases, rolling back the driver or removing the problematic hardware may resolve the Ntvdm CPU error.

Additionally, it is important to keep all device drivers up to date to minimize the risk of encountering compatibility issues with the Ntvdm CPU or other system components.

Malware Infections

Malware infections can disrupt various system processes, including the Ntvdm CPU, and cause it to encounter illegal instructions. Malicious software can modify or delete critical system files or interfere with essential processes, leading to errors or system instability.

If you suspect that your system is infected with malware, it is crucial to perform a thorough scan using reputable antivirus software. Removing any detected threats can help restore the proper functioning of the Ntvdm CPU and resolve the illegal instruction error.

Troubleshooting the Ntvdm CPU Error

If you encounter the Ntvdm CPU has encountered an illegal instruction error, there are several troubleshooting steps you can take to resolve the issue:

• Update your operating system: Keeping your Windows installation up to date ensures that you have the latest security patches and fixes, which can help resolve compatibility issues with the Ntvdm CPU.
• Perform a system file scan: Using the System File Checker tool can help identify and repair corrupted or missing system files that may be causing the error.
• Scan for malware infections: Running a full system scan with reputable antivirus software can help detect and remove any malware that may be interfering with the Ntvdm CPU.
• Check for hardware issues: If you recently installed new hardware or updated a device driver, consider rolling back the driver or removing the hardware to see if it resolves the error.
• Reinstall the problematic application: If the error occurs with a specific 16-bit application, try reinstalling it to ensure all necessary files are present and in working condition.

By following these troubleshooting steps, you can increase the likelihood of resolving the Ntvdm CPU error and getting your 16-bit applications to run smoothly again.

Understanding the Ntvdm CPU Error

When encountering the error message «The Ntvdm CPU Has Encountered an Illegal Instruction,» it signifies an issue with the NTVDM (NT Virtual DOS Machine) component of Windows. The NTVDM serves as a virtual machine that allows compatibility for executing 16-bit applications on modern 32-bit or 64-bit Windows systems.

This error typically occurs when the NTVDM encounters an instruction that it cannot process, often due to incompatible software or hardware configurations. It can also occur as a result of corrupt files or malware infections.

Troubleshooting the Ntvdm CPU Error

• Restart your computer and try running the application again.
• Ensure that your Windows operating system is up to date.
• Check for any recent software or hardware installations that might be causing conflicts.
• Scan your computer for malware using a reputable antivirus program.

If the issue persists, you may need to seek further assistance from a professional IT technician or contact Microsoft support for more specialized guidance.

Frequently Asked Questions

Here are some common questions about the error message «The Ntvdm CPU Has Encountered an Illegal Instruction» and their answers:

1. What does the error message «The Ntvdm CPU Has Encountered an Illegal Instruction» mean?

The error message «The Ntvdm CPU Has Encountered an Illegal Instruction» typically appears when running a 16-bit application on a 64-bit version of Windows. It indicates that the application is trying to execute an instruction that is not supported on the current operating system.

This error can also occur due to compatibility issues or corrupted files related to the application or the Windows system itself.

2. How can I fix the «The Ntvdm CPU Has Encountered an Illegal Instruction» error?

To resolve this error, you can try the following steps:

1. Update your Windows operating system to the latest version to ensure compatibility with older applications.

2. Run the application in compatibility mode by right-clicking on its executable file, selecting «Properties,» and then navigating to the «Compatibility» tab. Enable the «Run this program in compatibility mode for» option and choose the appropriate Windows version.

3. If the error persists, try reinstalling the application or running it in a virtual machine with an older version of Windows.

3. Can I still use 16-bit applications on a 64-bit version of Windows?

While 16-bit applications are not officially supported on 64-bit versions of Windows, there are several workarounds to run them:

1. Use an emulator or virtual machine software like DOSBox or VMware to run the application in a virtual environment with an older version of Windows.

2. Look for alternative software or updated versions of the application that are compatible with modern operating systems.

4. Are there any risks associated with running 16-bit applications on a 64-bit version of Windows?

Running 16-bit applications on a 64-bit version of Windows can pose some risks:

1. Security vulnerabilities: Older applications may not have the latest security patches, making them more susceptible to malware and other cybersecurity threats.

2. Compatibility issues: Some features or functionalities of the 16-bit application may not work as expected or may not work at all on a modern operating system.

It’s essential to take these risks into account and consider alternative options for running the application, such as using virtual machines or finding updated versions.

5. How do I identify the specific 16-bit application causing the error?

To identify the specific 16-bit application that is causing the «The Ntvdm CPU Has Encountered an Illegal Instruction» error, you can follow these steps:

1. Make a note of the error message and the associated file or process mentioned in the error dialog box.

2. Use Task Manager or another process monitoring tool to identify the specific process associated with the error.

3. Once you have identified the process, research the file or application name online to determine its purpose and if it is a known 16-bit application.

By following these steps, you can narrow down the specific application causing the error and take appropriate action to resolve it.

To wrap up, encountering the error message «The Ntvdm CPU has encountered an illegal instruction» can be frustrating and confusing. This error occurs when the NTVDM (NT Virtual DOS Machine) CPU encounters an instruction that it cannot execute properly. It is commonly seen on older versions of Windows, such as Windows XP, when trying to run 16-bit applications.

In order to fix this error, there are several steps you can take. Firstly, you can try running the application in compatibility mode by right-clicking on the executable and selecting the appropriate compatibility settings. If that doesn’t work, you can try reinstalling the application or updating your operating system to a newer version that supports 16-bit applications.

1. 10-24-2009

   
   

   #1

   
   Registered User
   

   ---

   exe error: «The NTVDM CPU has encountered an illegal instruction»
   

   I compiled a program with gcc using a makefile, and when I try to run the executable I get the following error:

   «C:\windows\system32\cmd.exe The NTVDM CPU has encountered an illegal instruction cS:0dca IP:01a7 OP:63 79 67 77 69»

   I think it may have something to do with the way my makefile is written. Does anyone see anything wrong with it?:

   Makefile:

   Code:

   bin_PROGRAMS = Program1
   
   
   SOURCE_DIR = $(top_srcdir)
   SOURCE_INCLUDE_DIR = $(SOURCE_DIR)/../../include
   SOURCE_COMMON_DIR = $(SOURCE_DIR)/../../common
   SOURCE_LDSCRIPT_DIR = $(SOURCE_DIR)
   
   
   CC=gcc
   AM_CFLAGS=-c -Wall
   AM_LDFLAGS=-M -T $(SOURCE_LDSCRIPT_DIR)/Linker.ld  
   SOURCES= $(SOURCE_DIR)/Main.c \
            $(SOURCE_DIR)/Error1.c \
            $(SOURCE_DIR)/File2.c \
            $(SOURCE_DIR)/File3.c \
            $(SOURCE_DIR)/File4.s \
            $(SOURCE_DIR)/File5.s 
   
   OBJECTS=$(SOURCES:.c=.o)
   
   
   
   all: Map
   	
   Map : $(OBJECTS) 
   	$(CC) $(AM_LDFLAGS) $(SOURCES) -o $@
   
   %.o : %.c 
   	$(CC) $(AM_CFLAGS) $< -o $@
   %.o : %.s 
   	$(CC) $(AM_CFLAGS) $< -o $@

   ---

2. 10-24-2009

   
   

   #2

   
   and the Hat of Guessing
   

   ---

   Have you googled that error message?

   Do you have something bizarre in your code that was appropriate for 16-bit machines only?

   ---

3. 10-25-2009

   
   

   #3

   
   Registered User
   

   ---

   The AM_LDFLAGS looks whacky unless you explain what it’s doing. Never seen a command where the path to the link-editor was specified. Also all «.s» files are processed by the assembler not the compiler, unless this make is a smart one to figure it out for you. Even then the macro AM_CFLAGS for the «%.o : %.s» rule would be invalid.

   Last edited by itCbitC; 10-25-2009 at 02:21 AM.

   ---

4. 10-25-2009

   
   

   #4

   
   Registered User
   

   ---

   Originally Posted by tabstop

   Have you googled that error message?

   Do you have something bizarre in your code that was appropriate for 16-bit machines only?

   Originally Posted by itCbitC

   The AM_LDFLAGS looks whacky unless you explain what it’s doing. Never seen a command where the path to the link-editor was specified. Also all «.s» files are processed by the assembler not the compiler, unless this make is a smart one to figure it out for you. Even then the macro AM_CFLAGS for the «%.o : %.s» rule would be invalid.

   I googled the error message and got:

   «You are getting this error because the file you are trying to run is trying to access the computer’s memory. Because you are not running the file on a DOS or Win 3.X machine, NTVDM will not allow this. NTVDM allows a 16-bit DOS program to execute on Windows. It is basically a DOS emulator .»

   I realized that the only place I am attempting to access the computer’s memory is in the linker script. I took these files from a program that was cross-compiled for an m68k processor but I need to compile it for the i686 also. Is there anything illegal about these instructions?:

   Code:

   PROVIDE (__stack = 0x60300);
   
   MEMORY
   {
       RomArea (rxi) : ORIGIN = 0x10000, LENGTH = 0x10000  
       GenArea (rxi) : ORIGIN = 0x60000, LENGTH = 0x2000
       RamArea (rwxi): ORIGIN = 0x62000, LENGTH = 0xE000
       HighLev (rwxi): ORIGIN = 0x70000, LENGTH = 0x200000
   }
   
   
   SECTIONS
   
   {
      
   	.text	0x70000	: { *(.text) } = 0x4e71 
   	.data	.	: { *(.data) } 
   	.bss	.	: { *(.bss) *(COMMON) } 
   		_bss_end__ = . ; 
   		__bss_end__ = . ;
   		. = ALIGN(32 / 8);
   		. = ALIGN(32 / 8);
   		__end__ = . ;
   		_end = .;
   		PROVIDE (end = .); 
   
   	.rodata .	: { } 
         .rodata.str1.1 .	: { } 
   	
   
   	.cnfgtbl 0x10000	: {*(.cnfgtbl) . = 0x10000; } /*Load configuration table here */
       
       
   	.genvers 0xFFFE : { . = 0x02; } =0xA5    
   
   
       	.aparea2  0x62000	: { . += 0xe000; }	/* Reserve  area */
         
       	.generic 0x60000	: { . = 0x2000; }	
       
   }

   itCbitC—

   I also took this makefile from the cross-compiled program and that is how the linker script reference is set up. Is there a more proper way to do this?

   Also, I wasn’t really sure what to do with the «.s» files since the other program didn’t have any. Do I list them elsewhere or not include them in the makefile?

   Thanks!

   ---

5. 10-25-2009

   
   

   #5

   
   Registered User
   

   ---

   Originally Posted by TheEngineer

   I realized that the only place I am attempting to access the computer’s memory is in the linker script. I took these files from a program that was cross-compiled for an m68k processor but I need to compile it for the i686 also. Is there anything illegal about these instructions?

   Herein lies your biggest problem. The m68k and x86 architectures are poles apart; the former is big-endian and uses linear addressing while the latter is little-endian and uses segmented addressing. You just can’t take a makefile specific to m68k and plop it into an x86 machine and expect it to work especially when that makefile has commands specific to a chipset.

   Originally Posted by TheEngineer

   Code:

   PROVIDE (__stack = 0x60300);
   
   MEMORY
   {
       RomArea (rxi) : ORIGIN = 0x10000, LENGTH = 0x10000  
       GenArea (rxi) : ORIGIN = 0x60000, LENGTH = 0x2000
       RamArea (rwxi): ORIGIN = 0x62000, LENGTH = 0xE000
       HighLev (rwxi): ORIGIN = 0x70000, LENGTH = 0x200000
   }
   
   
   SECTIONS
   
   {
      
   	.text	0x70000	: { *(.text) } = 0x4e71 
   	.data	.	: { *(.data) } 
   	.bss	.	: { *(.bss) *(COMMON) } 
   		_bss_end__ = . ; 
   		__bss_end__ = . ;
   		. = ALIGN(32 / 8);
   		. = ALIGN(32 / 8);
   		__end__ = . ;
   		_end = .;
   		PROVIDE (end = .); 
   
   	.rodata .	: { } 
         .rodata.str1.1 .	: { } 
   	
   
   	.cnfgtbl 0x10000	: {*(.cnfgtbl) . = 0x10000; } /*Load configuration table here */
       
       
   	.genvers 0xFFFE : { . = 0x02; } =0xA5    
   
   
       	.aparea2  0x62000	: { . += 0xe000; }	/* Reserve  area */
         
       	.generic 0x60000	: { . = 0x2000; }	
       
   }

   I’m not sure if this the output of the assembler on the x86 machine or if it’s a file that is the output of the m68k cross-compilation?

   Originally Posted by TheEngineer

   itCbitC—

   I also took this makefile from the cross-compiled program and that is how the linker script reference is set up. Is there a more proper way to do this?

   Yep! start from scratch. Write your own makefile for the target machine instead of using one that was built with a specific micro in mind. Alternatively strip the files of all m68k specifics and proceed with the compilation, altho’ I would prefer the former approach to the latter.

   Originally Posted by TheEngineer

   Also, I wasn’t really sure what to do with the «.s» files since the other program didn’t have any. Do I list them elsewhere or not include them in the makefile?

   Thanks!

   Were these «.s» files created on the x86 machine or did you port them over from the m68k cross-compilation? If the latter, then throw them away as they will generate arbitrary bit patterns that won’t translate to valid opcodes on the target x86 machine ie illegal instructions.

   ---

6. 10-25-2009

   
   

   #6

   
   Registered User
   

   ---

   I get this error when running Turbo C/C++, whenever a pointer goes awry and hits WindowsXP in a sensitive spot, or if the memory it’s given on start up, gets too low (by becoming fragmented or «lost»), typically during debugging sessions.

   It is a 16 bit program, of course.

   ---

7. 10-27-2009

   
   

   #7

   
   Registered User
   

   ---

   Originally Posted by itCbitC

   Herein lies your biggest problem. The m68k and x86 architectures are poles apart; the former is big-endian and uses linear addressing while the latter is little-endian and uses segmented addressing. You just can’t take a makefile specific to m68k and plop it into an x86 machine and expect it to work especially when that makefile has commands specific to a chipset.

   I’m not sure if this the output of the assembler on the x86 machine or if it’s a file that is the output of the m68k cross-compilation?

   Yep! start from scratch. Write your own makefile for the target machine instead of using one that was built with a specific micro in mind. Alternatively strip the files of all m68k specifics and proceed with the compilation, altho’ I would prefer the former approach to the latter.

   Were these «.s» files created on the x86 machine or did you port them over from the m68k cross-compilation? If the latter, then throw them away as they will generate arbitrary bit patterns that won’t translate to valid opcodes on the target x86 machine ie illegal instructions.

   I realize that the m68k makefile would not work on the i686, and I made all changes that I thought were necessary. Earlier you mentioned something about the path to the linker script and I was just wondering if you knew a different way to declare it if that will not work? I don’t get any errors about it when compiling. Also, the .s files and all the other source files were originally written with Green Hills Multi software and were then edited to work with gnu, so they did not come from the m68k. What should I do with them?

   The Makefile that I posted is one that I wrote from scratch, using just file locations and names from the m68k version. I have very little experience writing these, as you can tell, and am just looking for any advice about elements that may not work. Again, I’m not getting errors when compiling the exe file, but am getting an illegal instruction error when trying to open it.

   Thanks for your help

   ---

8. 10-27-2009

   
   

   #8

   
   Officially An Architect
   

   ---

   Originally Posted by TheEngineer

   «C:\windows\system32\cmd.exe The NTVDM CPU has encountered an illegal instruction cS:0dca IP:01a7 OP:63 79 67 77 69»

   If you decode the OP: bytes as ASCII values, the result is «cygwi». Which is suspiciously like «cygwin».

   Something is, obviously, hilariously wrong.

   Code:

   //try
   //{
   	if (a) do { f( b); } while(1);
   	else   do { f(!b); } while(1);
   //}

   ---

9. 10-27-2009

   
   

   #9

   
   Officially An Architect
   

   ---

   By the way, the linker script is probably completely irrelevant. All you’re trying to do is compile the code for Windows, right? Then you do not care about memory regions or image layout. Just remove the linker script entirely and see what happens.

   Code:

   //try
   //{
   	if (a) do { f( b); } while(1);
   	else   do { f(!b); } while(1);
   //}

   ---

10. 10-27-2009

    
    

    #10

    
    Registered User
    

    ---

    Originally Posted by brewbuck

    By the way, the linker script is probably completely irrelevant. All you’re trying to do is compile the code for Windows, right? Then you do not care about memory regions or image layout. Just remove the linker script entirely and see what happens.

    When I removed it I got some errors while compiling, which seems like progress. Thanks for the suggestion

    ---

11. 10-27-2009

    
    

    #11

    
    Registered User
    

    ---

    Originally Posted by TheEngineer

    When I removed it I got some errors while compiling, which seems like progress. Thanks for the suggestion

    Can you post the compile-time errors here so others can look at it and perhaps pinpoint their source.

    ---

12. 10-28-2009

    
    

    #12

    
    Registered User
    

    ---

    Originally Posted by itCbitC

    Can you post the compile-time errors here so others can look at it and perhaps pinpoint their source.

    Here is the output now when I try to make:

    Code:

    ../ProgramMain.c: In function `main':
    ../ProgramMain.c:224: warning: passing arg 2 of `LoadTestProgram' makes pointer from
     integer without a cast
    ../ProgramMain.c:80: warning: return type of 'main' is not `int'
    ../Assembly.s: Assembler messages:
    ../Assembly.s:10: Error: no such instruction: `ds.l 15'
    ../Assembly.s:15: Error: no such instruction: `movem.l %D0/%D1/%D2/%D3/%D4/%D5/%D
    6/%D7/%A0/%A1/%A2/%A3/%A4/%A5/%A6,RegStore'
    ../Assembly.s:16: Error: no such instruction: `link %A6,'
    ../Assembly.s:19: Error: no such instruction: `move.l 8(%A6),%A2'
    ../Assembly.s:22: Error: no such instruction: `jsr (%A2)'
    ../Assembly.s:24: Error: no such instruction: `move.l (%A7)+,%A4'
    ../Assembly.s:26: Error: no such instruction: `unlk %A6'
    ../Assembly.s:28: Error: no such instruction: `move.l (%SP)+,%A0'
    ../Assembly.s:29: Error: suffix or operands invalid for `add'
    ../Assembly.s:30: Error: no such instruction: `move.l %A0,-(%SP)'
    ../Assembly.s:31: Error: no such instruction: `movem.l RegStore,%D0/%D1/%D2/%D3/%
    D4/%D5/%D6/%D7/%A0/%A1/%A2/%A3/%A4/%A5/%A6'
    ../Assembly.s:33: Error: no such instruction: `rts '
    make: *** [Program] Error 1

    It seems to mostly be coming from one of my assembly files. I had these kinds of errors earlier when I was converting the assembly files from m68k, it seems strange that they would show up when the linker script is removed. Any ideas?

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13. 10-28-2009

    
    

    #13

    
    Registered User
    

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    Originally Posted by TheEngineer

    Here is the output now when I try to make:

    Code:

    ../ProgramMain.c: In function `main':
    ../ProgramMain.c:224: warning: passing arg 2 of `LoadTestProgram' makes pointer from
     integer without a cast
    ../ProgramMain.c:80: warning: return type of 'main' is not `int'
    ../Assembly.s: Assembler messages:
    ../Assembly.s:10: Error: no such instruction: `ds.l 15'
    ../Assembly.s:15: Error: no such instruction: `movem.l %D0/%D1/%D2/%D3/%D4/%D5/%D
    6/%D7/%A0/%A1/%A2/%A3/%A4/%A5/%A6,RegStore'
    ../Assembly.s:16: Error: no such instruction: `link %A6,'
    ../Assembly.s:19: Error: no such instruction: `move.l 8(%A6),%A2'
    ../Assembly.s:22: Error: no such instruction: `jsr (%A2)'
    ../Assembly.s:24: Error: no such instruction: `move.l (%A7)+,%A4'
    ../Assembly.s:26: Error: no such instruction: `unlk %A6'
    ../Assembly.s:28: Error: no such instruction: `move.l (%SP)+,%A0'
    ../Assembly.s:29: Error: suffix or operands invalid for `add'
    ../Assembly.s:30: Error: no such instruction: `move.l %A0,-(%SP)'
    ../Assembly.s:31: Error: no such instruction: `movem.l RegStore,%D0/%D1/%D2/%D3/%
    D4/%D5/%D6/%D7/%A0/%A1/%A2/%A3/%A4/%A5/%A6'
    ../Assembly.s:33: Error: no such instruction: `rts '
    make: *** [Program] Error 1

    It seems to mostly be coming from one of my assembly files. I had these kinds of errors earlier when I was converting the assembly files from m68k, it seems strange that they would show up when the linker script is removed. Any ideas?

    There are two kinds of errors: C programming errors which are easy to fix; the others are the assembler errors which are not possible to fix. In my earlier post I had told you to throw away the m68k assembly files as they will never work on the x86 machine because the instruction sets of these two micros are totally different. The «movem.l» and «unlnk» and «rts» instructions etc. are found on m68k assemblers only.

    You stated that the «.s» files had been generated on the x86 machine which is an incorrect statement. It seems that you have copied over everything blindly from the m68k cross-compilation without realizing that this process will never work on your Windows machine. Prefixing a percent sign to m68k registers like A4 or D2 won’t help either. The only portable thing between an m68k machine and the Windows (x86) machine is the source code written in C.

    ---

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Ntvdm.exe is an important component of your Windows Operating System (OS), as its function allows your OS to open 16-bit applications (such as MS DOS) in a 32-bit environment. With that said, this particular file is not unknown to hackers, as it is quite frequently targeted by such people, however, despite that reality, whenever people encounter problems with this specific file, it’s usually due to system issues such as program conflicts, the installation of certain system updates and data corruption. Thus, these are the kinds of things you should be mindful of, when tackling any computer issue related to this particular file.

Symptoms of Ntvdm.exe Errors

As this file is utilised whenever a user attempts to use a 16-bit application, it’s not uncommon for hackers to create viruses that disguise themselves as this particular file.

Typically what these unscrupulous people will do is create a virus, and give it a filename that is very similar to the file they are trying to disguise it as, but the biggest indication that the file is illegitimate is in the location, as it will usually be stored a location other than the official location for this particular file (Ntvdm.exe):

%SystemRoot%\System32

Adding digits at the end of the file name or changing a single letter are the most effective tactics deployed by these people. Through this method they are able to disguise a number of very malicious programs. The most commonly disguised virus types are as follows:

W32/Tilebot-JX (%SystemRoot%)
This is your common backdoor Trojan viruses that gets onto your computer and multiplies. This particular virus exploits a number of vulnerabilities in your Operating System, such as network shares, weak passwords and MSSQL servers in order to find its way onto your system.

W32/Sdbot-DFQ (%SystemRoot%)
This is another backdoor Trojan viruses; the primary function of this viruses is to allow hacker to gain access to your computer, remotely.

At any given time, you could have a number of what appears to be Ntvdm.exe files running as process on your computer. The presence of multiple instances of the same file/process is a strong indication of foul play, though it doesn’t necessarily mean you have a virus. However, if you find that you have this process running in the background even when you do not have any 16-bit application like MS DOS running, that’s a strong indication that your computer may be infected with a virus.

The Ntvdm.exe uses in excess of 90% of your CPU processing power.
This typically occurs when a user attempts to run certain MS DOS based applications, although there aren’t very many of these applications today. With that said, a DOS emulator is said to be a viable solution for this kind of problem.

The NTVDM CPU has encountered an illegal instruction.
This will occur when a running DOS based application crashes. This may also happen when you attempt to run a 32-bit application through MS DOS.

NTVDM encountered a hard error.
This error occurs when a running 16-bit application attempts to access a long filename; of which it’s not programmed to handle.

Note: Another common cause for Ntvdm.exe related errors is the installation of a specific security update (KB2707511). The uninstallation of this update is usually sufficient in fixing this problem, with that said, the symptoms exhibited, can mirror those described above.

Solutions for Ntvdm.exe Errors

Issues concerning this particular file are numerous, from the failed attempt to run certain 16-bit applications, to viruses disguising themselves as the file itself. Below are a number of solutions that I have found have helped most people rectify this problem. I recommend you try each method in sequential fashion, until you find the method that works for you.

Uninstall Windows Update (KB2707511)

One verifiable way of remedying this problem is to remove a specific Windows Update that is known to cause complications with the Ntvdm.exe file. The fastest method of doing this is to use Windows System Restore, but the suitability of that method is dependent on a number of factors, such as whether you have it properly configured on your system and you’re general understanding of how to use it. Thus, a restoration would only truly be necessary if you’re computer was severally infected with a viruses.

This method is only applicable for Windows XP users, so if you’re on Windows Vista/7, then I suggest you skip this method.

Anyway, to remove this update, please do the following.

1. First, ensure you’ve booted into your computer with administrative rights.

2. Then, click on Start -> Run, type appwiz.cpl and click on OK.

3. This will bring up the Add or Remove Programs applet; from here check the box next to Show Updates, then scroll down to the Windows Update KB2707511, click on it, and then click on Remove.

Note: The security update may also be titled KB2823324, so be sure to check for both KB2823324 and KB2707511 and Remove whichever you find.

Alternatively, if you’re unable to find the update, then I recommend you use the uninstallation tool called Express Uninstaller, as it will allow you to uninstall far more drivers, tools and applications on your computer than the conventional built-in uninstaller. Anyway, you can download this tool from here:

CLICK HERE TO CHECK OUT EXPRESS UNINSTALLER

Apply Hotfix

Microsoft in the past released a hotfix that is said to be capable of correcting problems with the Ntvdm.exe file. This hotfix should only be applied to systems that are having issues with the Ntvdm.exe file due to data corruption or application conflicts and NOT viruses.

In order for you to apply this update, you will need to be running Windows XP Service Pack 3 (SP3). If you’re on a Windows XP machine, but you don’t have the latest service pack, then you will have to download it first. You can download it from here: http://www.microsoft.com/en-us/download/details.aspx?id=24

This update will not make any changes to your registry once applied, although you will be required to restart your system once the process has completed. Anyway, you can download the hotfix from here: http://support.microsoft.com/kb/2732488

Remove Ntvdm.exe Malware

If the method outlined above didn’t work for you or if you are running a Windows Vista/7 based system, then it’s fair to assume that you may have some kind of virus on your computer. One tell-tell sign that you have a virus on your computer is if the ntvdm.exe process is running when you are not using a 16-bit application such as MS DOS (as previously mentioned).

Another positive indication that your compute may be infected with a virus is if the ntvdm.exe file is using an inordinate amount of CPU power and hard drive space. All of this can be examined using Windows Task Manager, which you can run by first pressing Control + ALT + DELETE [Windows Vista/7: Click on Windows Task Manager Button], then finally click on Processes Tab.

The real Ntvdm.exe file will show up under Processes in all caps with a lower case file extension (NTVDM.exe). However, whenever you receive any system alerts and error messages they will usually spell the process out with all caps, like NTVDM.EXE.

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