Одна из распространенных ошибок в Windows 10 — синий экран «На вашем ПК возникла проблема, и его необходимо перезагрузить» с указанием кода остановки 0xc000021a. Ошибка может возникнуть после установки обновлений, при попытке восстановить систему с использованием точек восстановления, иногда — в результате обновления драйверов, установки некоторых специфичных программ или твиков системы, влияющих на системные файлы.
В этой инструкции подробно о возможных способах исправить ошибку 0xc000021a в Windows 10 в зависимости от ситуации. С большой вероятностью один из способов поможет сравнительно легко решить проблему.
Восстановление системы при коде остановки 0xc000021a
Прежде чем приступить непосредственно к методам решения проблемы, обратите внимание, где именно мы будем её решать, при условии, что Windows 10 при загрузке показывает синий экран с ошибкой 0xc000021a.
После нескольких перезагрузок компьютера с этой ошибкой вы увидите сообщение «Подготовка автоматического восстановления», затем — «Диагностика компьютера».
По завершении диагностики появится экран с заголовком «Автоматическое восстановление» и сообщением о том, что компьютер запущен некорректно. Он нам и нужен: нажмите кнопку «Дополнительные параметры».
Будет запущена среда восстановления Windows 10 с инструментами, которые пригодятся нам для восстановления работоспособности компьютера или ноутбука. Другие способы запустить среду восстановления Windows 10 (например, можно использовать загрузочную флешку, если описанный выше метод в вашем случае не срабатывает).
Отключение проверки цифровой подписи драйверов
Первый из способов, который срабатывает в тех случаях, когда вы столкнулись с кодом остановки 0xc000021a — временно отключить проверку цифровой подписи драйверов. Этот метод подойдет в тех случаях, когда ошибка возникла после установки обновлений (в том числе драйверов), при восстановлении из точки восстановления, а также после установки некоторых программ.
Порядок действий будет следующим:
- На первом экране среды восстановления (как попасть в неё рассматривалось выше) выберите «Поиск и устранение неисправностей».
- Затем перейдите в раздел «Дополнительные параметры», нажмите «Параметры загрузки» а затем кнопку «Перезагрузить».
- Компьютер перезагрузится, а затем вы увидите экран с параметрами загрузки. Нажмите клавишу F7 (на некоторых ноутбуках — Fn+F7) для того, чтобы загрузить Windows 10 с отключенной проверкой подписи драйверов.
- Если загрузка в этот раз пройдет успешно, дождитесь окончательной загрузки Windows 10 и, если она будет завершать установку обновлений или какого-либо ПО, разрешите системе выполнить это.
- Перезагрузите компьютер в обычном режиме, если это наш случай — в этот раз компьютер загрузится без ошибок.
- Если с отключенной проверкой цифровой подписи драйверов компьютер загружается, а последующая обычная перезагрузка не работает — попробуйте откатить драйверы (если вы выполняли их обновление перед появлением проблемы) или удалить недавно установленные антивирусы и сторонние программы, особенно те из них, которые устанавливают драйверы виртуальных устройств на компьютере.
Инструкция с другими методами проделать то же самое: Как отключить проверку цифровой подписи драйверов в Windows 10.
Восстановление целостности системных файлов при ошибке 0xc000021a
Эта же ошибка бывает вызвана повреждением важных системных файлов Windows 10: в частности, если повредить или удалить файлы csrss.exe или winlogon.exe, вы получите именно этот код остановки.
Решение будет следующим:
- В среде восстановления перейдите к разделу «Поиск и устранение неисправностей» — «Дополнительные параметры» — «Командная строка».
- В запустившейся командной строке используйте команду
sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows
Простой ввод sfc /scannow в среде восстановления не сработает, подробнее об этом в материале Восстановление целостности системных файлов Windows 10.
- После ввода команды (не пропустите пробелы) нажмите Enter и дождитесь завершения процесса, который может занять продолжительное время.
- Если нам повезло, вы увидите сообщение «Программа защиты ресурсов Windows обнаружила поврежденные файлы и успешно их восстановила».
Если всё получилось, закройте командную строку и перезагрузите компьютер: в сценарии, когда причина была в измененных или поврежденных системных файлах, синий экран 0xc000021a появиться не должен.
Точки восстановления и удаление обновлений
Если два предыдущих метода не помогли в исправлении ошибки, обратите внимание на еще два пункта «Дополнительных параметров» среды восстановления:
- Восстановление системы — восстановление Windows с помощью точки восстановления. При наличии точек восстановления, попробуйте использовать этот пункт, даже в том случае, если сама ошибка начала появляться именно после использования точек восстановления, но из интерфейса Windows
- Удалить обновления — с помощью этого пункта вы можете удалить недавно установленные обновления Windows 10, которые могли послужить причиной появления ошибки.
Если же ничего из этого не помогло, могу предложить либо попробовать вручную восстановить реестр Windows 10 (к сожалению, в последних версиях системы затруднительно — они не хранят автоматическую резервную копию реестра) или восстановить систему к первоначальному состоянию (в том числе и с сохранением данных).
Необходимый пункт с названием «Вернуть компьютер в исходное состояние» для запуска восстановления вы найдете в разделе «Поиск и устранение неисправностей». Суть этого действия описана в статье Как сбросить Windows 10 или автоматическая переустановка ОС.
Microsoft keeps launching Windows updates to resolve the problems in the older version or remove bugs. But the newer version may have other bugs and undesirable problems for users. One of the most common and irritating errors in different versions is Windows Stop Code 0xC000021A.
9 Solutions to Fix Windows Stop Code 0xC000021A
This error makes it hard for a user to start his device and use it for their desired purposes. Also, this error has become a hurdle for many users who want to perform their tasks quickly. Do you want to learn the best fixes for this problem? This guide will help you understand 8 fixes to solve this error.
| Workable Solutions | Step-by-step Troubleshooting |
|---|---|
| 1. Unplug All External Devices | You should have to unplug them and keep restarting your device…Full steps |
| 2. Repair Corrupted System Files | Select the language preference. Then, click «Repair Your Computer»…Full steps |
| 3. Update Device Drivers | Boot in Safe Mode in Windows 10. Right-click on the start button…Full steps |
| 4. Rebuild BCD | Go to Troubleshoot menu. Look for Advanced Options and…Full steps |
| Other Solutions | Disable the Driver Signature Enforcement Feature > Reset BIOS…Full steps |
What Is Windows 10: BSOD Error 0xC000021A?
0xC000021A is a common error with multiple names including stop code, death error, and others. You will get a blue death screen showing this error and a notification, «Your PC ran into a problem and needs to restart» It means that the system has detected some problem with your device that needs to be fixed.
This Windows error is common in all versions instead of any specific version. Doesn’t matter which version you are using, you may have experienced this error. But the main question is why this error occurs in all systems. Let us show you a few reasons for this error to make it understandable.
- Affected software or program involvement.
- Incompatible 3rd party applications.
- Damaged system registry.
- Incomplete loading of the library.
No doubt, there can be many other reasons for Windows stop code 0xC000021A. But the above-mentioned are considered the most common causes behind this specific error. Now, it is time to learn how to fix these problems to resolve this error and keep using your device smoothly.
Read Also: Blue Screen of Death Error 0x000000C5, Green Screen of Death
Additional Help: How to Recover Data Before Fix Error 0xC000021A
Before fixing this Windows step error or any other error, we recommend you add recovery software. It is common to lose your data while you are trying to resolve such problems. The best way is to add a program before fixing any issue to make sure that you will get your data back if lost.
EaseUS Data Recovery Wizard is one of the best programs we recommend to you. Doesn’t matter which Windows version you are using, it enables you to recover your data. This software has been designed with a working interface that is compatible with all versions of Windows.
Along with versatile compatibility, this program has multiple features. It enables you to experience outstanding features that may not be available in any other data recovery software. Let’s have a look at its best features quickly.
- This program will recover deleted files within a few minutes. It will not take prominent time because of its fast algorithm.
- Your data will never be affected by this tool. It will recover your files in the original format without overwriting them.
- It will never ask you to reboot or reinstall Windows.
- This data recovery software has a user-friendly interface.
Due to these advanced features, we recommend you choose EaseUS Data Recovery Wizard WinPE. You will never be disappointed by using this product to recover your lost data.
Step 1. Select a drive and start scanning
Launch EaseUS Data Recovery Wizard and hover over the partition where you lost data. This could be an internal hard disk, external disk, USB, or SD card. Then, click «Search for Lost Data».
Step 2. Check and preview scanned files
Use the file format filter on the left or upper right corner to narrow the scan results until you find the files you need. Then, you can click the «Preview» button or double-click a file to preview its content, if you’d like.
Step 3. Recover lost data to a secure location
Click the checkbox next to the file and click «Recover» to restore the lost data to your local storage or Cloud drive. We recommend that you do not store the recovered data on the disk where you lost it earlier.
9 Best Solutions to Fix Windows Stop Code 0xC000021A
With the above discussion, you must have got an idea about the causes of Windows 10 BSOD code 0xC000021A. In this section, we will show you some of the best fixes to follow to resolve this error. Keep in mind that not all solutions work for you. It is possible that you have to keep trying all the following fixes to find the one that works for you.
Abide by this, you can also get an idea about how to fix this error by watching this video tutorial. In this video, the complete method has been discussed step-by-step.
- 0:25 Fix MBR and system file
- 1:25 Fix BCD error
Method 1. Disconnect or Unplug All External Devices
As mentioned above, a common reason behind this error is the interference of external devices. So, you should try fixing this error by disconnecting all external devices one by one. The best way is to look at all those devices and keep disconnecting or unplugging them.
You should have to unplug them and keep restarting your device. If the error has been resolved, it means that the error is because of an external device. If your device is still showing Windows stop error 0xC000021A, you should keep trying the next methods.
Method 2. Run Windows Boot Repair Tool
If you encounter a blue screen error, the first thing you can try is to use EaseUS Partition Master for boot repair. This tool creates WinPE bootable disks and applies the «Boot Repair» feature to fix all boot errors on the disks to keep your system running efficiently.
If your computer is unbootable now, start with Step 1 here. If it’s bootable, move to Step 3 and start the process.
Step 1. Prepare a new PC and create a bootable media with EaseUS Partition Master
- On a new computer, connect an empty USB to your PC.
- Install and launch EaseUS Partition Master, go to the Bootable Media section, select «Create bootable media» and click «Next».
- Select the empty USB or external disk as target disk to create the bootable media for creating a Blue Screen error check tool.
Step 2. Boot PC from EaseUS bootable USB
Then, connect the bootable USB to your PC with Blue screen error, and reboot PC from the USB by configuring it as a boot drive. The process is: restart PC, press F2/F8/F11/Del key to enter BIOS, go to boot menu and configure the USB as boot drive, save changes and restart the PC.
Step 3. Enable EaseUS Partition Master with its Boot Repair feature, and open «Blue Screen» tool.
When EaseUS Partition Master launches, go to the Toolkit section and click «Boot Repair».
Then, click «Blue Screen» and click the listed Blue Screen error to check it’s details. Or, you can type in a specific blue screen code or description to find the respective answer for fixing it.
Step 4. Fix blue screen error
- Now, you can follow the solution guide to get rid of the respective BSOD or blue screen issue from your PC.
- If it doesn’t work, you can also click the «Live Chat» button to request a remote assistance for fixing this issue with the help of EaseUS tech support team.
Download this full-featured Windows boot repair tool and solve your problem! You may also like the following topics:
⭐Ask For Help
If you still have questions or want to learn more about this tool, the EaseUS experts are here to help:
EaseUS experts are available to provide you with 1-on-1 manual services (24*7) and help fix Windows boot error, BSOD or computer boot loop issues. Our experts will offer you FREE evaluation services and efficiently diagnose and resolve system boot failure, Windows stop codes and OS lagging issues using their decades of experiences.
- 1. Fix BSOD — blue/black screen of death error due to Windows update or other reasons.
- 2. Get rid of Windows boot error such as no bootable device found, or BCD file corruption.
- 3. Serve to fix 0X000_error codes on Windows system or OS boot loop issues.
Method 3. Repair Corrupted System Files from the Installation
Another effective way to remove this blue screen of death error is by repairing the corrupted files of the system. The process is also simple and can be accomplished using simple steps. We have discussed them in the following section.
Note: You need to make a Windows media creation tool and boot from it. Then, follow the steps below:
Step 1. Select the language preference. Then, click «Repair Your Computer».
Step 2. Click «Troubleshoot» and then choose the advanced options. Click «Command Prompt».
Step 3. When the Command Prompt opens up, type chkdsk C: /r and press Enter.
Step 4. Enter sfc/scannow and click on the Enter button.
Once you have done with the above steps, don’t forget to restart your system. By doing this, you will allow your system to settle its operating system as well as let you know whether the error has been resolved or not.
Method 4. Update Device Drivers to Fix the BSOD Error
It is a common habit to forget about the updates of the device drivers by most of the users. Mostly, the users won’t update drivers which can lead them to this error and others too. So, you can try updating device drivers to solve this problem. Here are the steps that you can follow for this.
Step 1. Boot in Safe Mode in Windows 10.
Step 2. Right-click on the start button to open the menu bar.
Step 3. Choose Device Manager from the given options.
Step 4. Double-click on the device option to open a new small window.
Step 5. Now, click on the Driver option from the menu bar and choose Update Driver.
Step 6. Click «Search automatically for driver software».
Step 7. Tap on the option related to updates given at the bottom of the new window.
It will start updating the outdated drivers of your device to make your device updated. It might be possible that error 0xC000021A has been resolved and your system will start working smoothly.
Method 5. Rebuild the Boot Configuration Data (BCD) to Fix Code 0xC000021A
If you are getting this error in Windows 10, it might be due to BCD (Boot Configuration Data). The reason is it is responsible for Windows 10 operations startups. By fixing this, you may be able to resolve this error. Boot from the creative media and follow the steps below.
Step 1. Go to Troubleshoot menu. Look for Advanced Options and then Command Prompt.
Step 2. Type the following command in the Command Prompt and press Enter.
- bootrec /fixmbr
- bootrec /fixboot
By following these steps, it is possible to resolve Windows 10 BSOD code 0xC00021A. The reason is that it will rebuild the entire configuration of your Windows.
Method 6. Disable the Driver Signature Enforcement Feature
Many users download and install software that is not digitally signed. Such software or programs are restricted from working by this specific driver. It can also show you this error and your device will start showing this error again and again. So, you should have to follow these steps to disable this driver.
- Start your computer and keep pressing F8 or F11.
- Boot with the recovery option by following this pathway, Troubleshoot > Advanced Options > Startup Settings > Restart
- Now, keep pressing F7 to disable this driver and reboot your system
By doing this, it is possible that Windows stop error 0xC000021A has been solved. The reason is it is considered the most common reason behind this error.
Method 7. Reset BIOS to Fix Code 0xC000021A
BIOS resetting can be a solution for this error as well as keep you safe from other problems too. To remain on the safe side, you should have to reset the BIOS of your device. Let us show you some points for this purpose.
Step 1. In the troubleshooting menu, find and select UEFI Firmware Settings.
Step 2. Tap on the Restart button to enter the BIOS system.
Step 3. Find the option «Reset Configuration Data» to accomplish this task.
Step 4. Save the New settings and restart your computer for smooth working.
This is all you have to do for resetting the operating system of your device and keep your data safe from any unauthorized access.
Method 8. Perform a System Restore to Fix Code 0xC000021A
Another effective way to resolve Windows 10 BSOD code 0xC000021A is to perform a system restore in Windows 10. You should have restored the system to check whether the error has been resolved or not. Here are the steps through which you can restore the system safely.
Step 1. Go to Advance Startup and look for «System Restore».
Step 2. Select a point to restore your system.
Step 3. Tap on the Next button and follow the on-screen instructions.
Don’t worry if you are not familiar with this process as the on-screen instructions will be simple to follow. You can follow them just by reading them once instead of looking for video tutorials.
Method 9. Reinstall Windows 10 to Fix Windows Stop Code 0xC000021A
If nothing works from the above fixes, the last fix that you can try is to reinstall Windows 10. By doing this, you will be able to settle all the files related to the OS of your device. Along with this, you will be able to install the updated device in your device with this installation. To do so, you need to follow these steps.
- Insert CD/DVD or attach USB for this installation
- Choose «Create Installation media USB for another PC»
Now, you have to follow the on-screen instructions to install the new copy of the Windows
Conclusion
In the above blog, we have comprehensively discussed all those methods with the help of which you can resolve Windows stop code 0xC000021A. You only have to follow these methods one by one to get your device in a smooth condition.
Keep in mind that you shouldn’t quit the process unless you have found the right fix. It is possible that you have to follow the procedure of more than one fix to find the right one.
1
Windows Stop Code 0xC000021A FAQs
If you still have problems, read the frequently asked questions to get additional help.
1. What does 0xC000021A mean?
It is a particular error that has multiple names including death screen, Windows stop code, and others. In this error, you will get a blue screen with a notification «Your PC ran into a problem and need to restart».
2. How do you stop the blue screen of death?
To stop BSOD Windows 10, you can follow the above list of fixes. Any of the above-mentioned solutions will be useful for you.
3. What is a green screen of Death?
Windows green screen is a particular error that can damage the basic elements of your system as well as make your PC inaccessible.
4. How do I fix the kernel mode heap corruption?
There are different ways to solve the kernel mode heap corruption but the best one is to update device drivers. You should keep trying to update drivers related to different fields or tasks like graphics.
Все способы:
- Способ 1: Отключение подписи драйверов
- Способ 2: Восстановление целостности системных файлов
- Способ 3: Откат к точке восстановления
- Способ 4: Удаление обновлений или исправлений
- Вопросы и ответы: 0
Распространенная критическая ошибка, вызываемая в большинстве случаев повреждением системных файлов либо нарушением их безопасности. Может возникнуть после установки содержащих баги обновлений и некоторых сторонних программ, оказывающих влияние на файлы ядра Windows 10.
Способ 1: Отключение подписи драйверов
Этот способ эффективен, если ошибку 0xc0000021a вы получили после установки обновлений, драйверов или некоторых программ, включающих драйвера в файл установщика. Решается проблема отключением цифровой подписи драйверов.
- Зайдите в среду восстановления, для чего дважды прервите загрузку компьютера на раннем этапе нажатием кнопки питания. Также вы можете загрузить Windows в режим автоматического восстановления, просто перезагрузив компьютер несколько раз и нажав на экране с предложением запустить процедуру автовосстановления кнопку «Дополнительные параметры».
- Попав в среду WinPE, выберите «Поиск и устранение неисправностей» → «Параметры загрузки». Нажмите кнопку «Перезагрузить».
- Компьютер перезагрузится, при этом вы попадете на экран настроек загрузки. Чтобы загрузить систему с отключенной проверкой подписи драйверов, нажмите клавишу F7.
Если компьютер загрузится успешно, удалите или откатите установленные/обновленные драйвера, деинсталлируйте программы или обновления, которые предположительно могли вызвать ошибку.
Способ 2: Восстановление целостности системных файлов
Повреждение или удаление системных файлов, в первую очередь таких как csrss.exe или winlogon.exe, является самой распространенной причиной ошибки 0xc000021a. В этом случае действенным решением станет их восстановление из встроенного хранилища.
- Загрузите компьютер с установочной флешки с дистрибутивом Windows 10, а когда на экране появится окно мастера-установщика системы, нажмите комбинацию клавиш Shift + F10, чтобы вызвать «Командную строку».
- Определите буквы системных разделов, для чего выполните в консоли команды
diskpart,list volumeиexit. Так вы получите список всех имеющихся на дисках томов. - Затем выполните команду проверки и восстановления
sfc /scannow /offbootdir=C:\ /offwindir=D:\windows, где C — буква загрузочного раздела, а D — буква с установленной Windows.
В случае обнаружения утилитой «SFC» повреждений пула системных файлов, последние будут восстановлены из хранилища компонентов.
Способ 3: Откат к точке восстановления
Если на компьютере включена защита системного раздела, выполните откат к точке восстановления. Это эффективный способ устранения многих проблем, вызванных повреждением файлов и реестра Windows 10.
- Загрузитесь в загрузочную среду WinPE, как было показано выше, и выберите «Поиск и исправление неисправностей» → «Восстановление системы».
- Укажите, если необходимо, целевую операционную систему.
- Нажмите в окне средства «Восстановления системы» кнопку «Далее» и проследуйте указаниям мастера.
Способ 4: Удаление обновлений или исправлений
Если ошибка возникла после установки плановых накопительных обновлений или новой сборки Windows 10, предпримите следующие шаги.
- Загрузившись в среду восстановления, выберите «Поиск и исправление неисправностей» → «Удалить обновления».
- Выберите тип действия. Если нужно удалить исправления (патчи), нажмите «Удалить последнее исправление», если же вы хотите откатиться к предыдущей сборке, выбирайте опцию «Удалить последнее обновление компонентов».
- Укажите при надобности целевую операционную систему.
- Подтвердите выбранное действие нажатием соответствующей кнопки, дождитесь завершения операции и загрузите компьютер в обычном режиме.
Если устранить ошибку 0xc0000021a не удалось ни одним из описанных способов, сбросьте Windows 10 к исходному состоянию.
Подробнее: Возвращаем Windows 10 к заводскому состоянию
Наша группа в TelegramПолезные советы и помощь
Table of contents
- Why Do I Get the Windows 10 Install Error 0xc000021a?
- First Method: Unplugging External Devices
- Second Method: Booting Windows Without the Driver Signature Enforcement Feature
- Third Method: Running an SFC Scan
- Fourth Method: Running a DISM Scan
- Fifth Method: Rebuilding the Boot Configuration Data
- Sixth Method: Checking the Health of Your HDD
- Seventh Method: Disabling Certain Services
It is true that Microsoft regularly pushes updates that will fix bugs and errors on the Windows 10 operating system. However, there are times when these updates cause more harm than good to PCs. One of the possible errors you may encounter is the hex code 0xc000021a. This error typically comes in the form of a Blue Screen of Death (BSOD), and it may damage the internal structure of your operating system.
While the Installation Error 0xc000021a is rare, its problems may escalate quickly. Due to the gravity of this issue, it can be challenging to address it. However, you should not worry because we will teach you how to easily fix the BSOD Error 0xc000021a on Windows 10.
Why Do I Get the Windows 10 Install Error 0xc000021a?
Most of the time, the Error 0xc000021a appears when users upgrade their operating system to Windows 10. This BSOD error prevents users from booting their computer properly. There are various reasons for this issue. It is possible that your peripheral devices are interfering with the startup process. Aside from that, some crucial system files responsible for login and logout operations could be corrupted, missing, or damaged.
Whatever caused the Error 0xc000021a, you should not panic because we have plenty of solutions for you. In this post, you will find useful tips on how to fix the Error 0xc000021a on Windows 10.
First Method: Unplugging External Devices
As we’ve mentioned, it is possible that peripheral devices are causing critical system errors on your computer. They may be interfering with the startup process, causing the Error 0xc000021a to appear. So, we recommend unplugging all the external devices connected to your PC. Try booting your system, then check if the error persists. If it is gone, then it means that one of the devices is causing the problem. Plug the devices one by one and try restarting your computer until you determine the culprit. Once you’ve found the faulty peripheral device, you can replace it with a new one.
Second Method: Booting Windows Without the Driver Signature Enforcement Feature
Booting into Safe Mode is a great way to troubleshoot various errors on Windows 10. For this particular issue, it is best that you boot your OS with the Driver Signature Enforcement feature disabled. This feature is a security measure that prevents drivers that are not digitally signed from running on Windows 10. That said, it can cause the Error 0xc000021a to appear. So, you need to disable it when booting into your system. Here are the steps:
- Press
Windows Keyon your keyboard. - Press and hold
Shift, then click the Power icon. - Select Restart. These steps should let you boot into the Recovery options menu. If you do not see this feature, you may need to boot your system through a Windows bootable USB drive.
- Once you are inside the Recovery options menu, follow this path:
Troubleshoot ->Advanced Options ->Startup Settings
- Select Restart.
- Once your computer restarts, press
F7to select the ‘Disable driver signature enforcement’ option.
After performing these steps, you should be able to access various features in your system, allowing you to troubleshoot the problem.
Third Method: Running an SFC Scan
As we’ve mentioned earlier, it is possible that system files crucial to the startup process have been corrupted. Thankfully, Windows 10 has a utility that is specifically designed to fix issues like this. The System File Checker (SFC) can detect faulty system files and repair or replace them accordingly. Here are the steps to running an SFC scan:
- Go to your taskbar, then click the Search icon.
- Inside the Search box, type
Command Prompt. - From the results, you will see Command Prompt. Right-click it, then select Run as Administrator from the options.
- Once Command Prompt is open, paste the command line below and press
Enter:
sfc/scannow
The System File Checker will begin the scanning and repair process. Once it is complete, restart your computer and check if the error is gone. If it persists, try the next solution.
Fourth Method: Running a DISM Scan
- You need to run Command Prompt with administrative privileges. To do this, follow Steps 1 to 3 from the third solution.
- Inside Command Prompt, type
DISM /Online /Cleanup-Image /RestoreHealth. - Press
Enteron your keyboard to run the command.
The DISM scan process will now begin. Keep in mind that this usually takes about 20 minutes to complete. So, be patient and do not interfere with it.
Fix this issue quickly
You can try using a safe and totally free tool developed by the Auslogics team of experts.
A few simple steps to troubleshoot the issue:
Download the tiny Auslogics TroubleShooter tool.
Run the application (no installation is needed).
The app will check for the issue mentioned in the article. When the scan is done, check that this is the issue you were looking to solve and click ‘Apply now’ to apply the recommended fix.
You can use the app to troubleshoot other malfunctions for free by simply typing in a brief description of the issue your PC is experiencing. Or you can scan your PC for performance issues using the My Scanner tab.
Fifth Method: Rebuilding the Boot Configuration Data
It is possible that the boot sector has been corrupted or deleted, which is why your computer is unable to read the installation setup in a repeated sequence. In this case, you need to rebuild the Boot Configuration Data (BCD). If the Error 0xc000021a appears while you’re trying to upgrade your OS, rebuilding the BCD will allow you to load the installation files seamlessly. To begin, follow the steps below:
- Plug the Windows 10 bootable drive, then restart your computer.
- Set the bootable drive as the primary boot device. You can do this by entering the Boot menu or by accessing the BIOS settings. Once you’ve done this step, the installation files will start to load.
- Select your preferred language, keyboard input, and date/time. Click Next to proceed.
- Go to the bottom-left corner, then select Repair Your Computer.
- Choose Troubleshoot, then select Advanced Options.
- Launch Command Prompt.
- Run the following command lines one by one:
bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd
After running the command lines above, you should be able to begin the Windows 10 installation process.
Sixth Method: Checking the Health of Your HDD
If you’ve tried the solutions above and the Error 0xc000021a persists, it is possible that there is something wrong with your HDD. So, we recommend that you run some diagnostic tests to identify bad sectors or damages. There are plenty of third-party tools that you can use to fix this problem. However, you always have the option to use Windows 10’s built-in utility for checking HDD problems. You can begin the process by following the instructions below:
- On your keyboard, press
Windows Key+E. Doing so will launch File Explorer. - Right-click your system partition, then select Properties.
- Once the Properties window is up, go to the Tools tab.
- Under the Error Checking section, click the Check button.
Let the utility scan for HDD issues. It will also fix the problems automatically.
Seventh Method: Disabling Certain Services
It is possible that certain services are interfering with the update process. As such, we recommend that you disable them on startup. Here are the steps:
- On your keyboard, press
Windows Key+R. This should open the Run dialog box. - Inside the box, type
msconfig, then click OK. - Once the System Configuration Window is up, go to the Services tab.
- Make sure that the ‘Hide all Microsoft services’ option is deselected.
- Click Disable All.
- Click Apply.
- Now, go to the Startup tab.
- Click the Open Task Manager link.
- Once you’re inside the Task Manager, disable the processes one by one.
- Exit the Task Manager then click OK on the System Configuration window.
- Restart your computer.
Once you boot into the system, check if the Error 0xc000021a is gone. If it is gone, then it is likely that one of the services is interfering with the update process. In this case, we recommend enabling the services one by one and restarting your computer until you determine the culprit.
Pro Tip: After getting rid of the Error 000021a, you would want to commence the update installation with ease. To ensure that your computer is ready for the process, we suggest that you use Auslogics BoostSpeed. This tool has a reliable and efficient cleaning module that will sweep out all types of junk, including web browser cache, temporary files, and leftover Windows Update files, among many others. It will also help restore system stability by carefully removing corrupt keys and invalid entries from the registry. After the process is complete, you will notice a significant improvement in the performance of your computer.
Can you think of other methods for resolving the Error 0xc000021a?
Do not hesitate to share them in the comments section below!