Если переустановка нужна для того, чтобы восстановить работоспособность «Защитника», сначала ознакомьтесь с нашим отдельным материалам, где описаны наиболее распространенные проблемы и возможные пути их решения. Вероятно, после применения разобранных способов уже не потребуется переустановка средства.
Подробнее: Не запускается встроенный «Защитник» в Windows 10
Шаг 1: Отключение Microsoft Defender
Перед установкой «Microsoft Defender» придется его отключить. Поскольку средство защиты является системным, полностью его удалить нельзя, да и не рекомендуется это пытаться делать.
Делается это как через штатные средства системы, так и с помощью специализированных утилит, которые устанавливаются отдельно. Ранее наш автор разбирал способы полной деактивации встроенной защиты операционной системы в другом руководстве. Сначала перейдите к нему, выключите «Защитник», после чего можно переходить к следующему шагу данной инструкции. Соблюдая эти рекомендации, вы минимизируете возможность конфликта программного обеспечения при установке.
Подробнее: Отключение Защитника в Windows 10
Шаг 2: Скачивание и установка
Следующий этап – это непосредственное скачивание «Защитника» Windows с официального сайта компании Microsoft. В этом случае сторонние источники для загрузки не подойдут, поскольку важна безопасность и надежность. «Defender» распространяется производителем бесплатно, а алгоритм действий достаточно прост:
Скачать Microsoft Defender с официального сайта
- Кликните по кнопке выше, чтобы перейти к скачиванию «Защитника» с официального ресурса. На открывшейся странице нажмите на кнопку «Install».
- Во всплывающем окне браузера выберите «Открыть приложение».
- После этого запустится приложение официального магазина Microsoft Store, которое должно быть предустановлено у вас в системе. Нажмите на кнопку «Получить» и дождитесь скачивания защитного средства. Инсталляция выполнится автоматически сразу после загрузки.
Читайте также: Установка Microsoft Store в Windows 10
Если в дальнейшем потребуется переустановить и эту версию программного обеспечения (скачанное из магазина приложений Microsoft Store), то можно сначала удалить софт, используя встроенные возможности системы. Например, для этого подойдут штатные «Параметры»:
- Нажмите на кнопку «Пуск», затем выберите «Параметры».
- Перейдите в раздел «Приложения».
- В отобразившемся списке установленных программ найдите «Microsoft Defender», кликните по названию левой кнопкой мыши, затем нажмите на появившуюся кнопку «Удалить».
Останется подтвердить действие и дождаться полного удаления программы с компьютера, а затем можно переходить к скачиванию и проделать то же самое, что в предыдущей инструкции. Следует отметить, что в магазине от Microsoft всегда доступна для скачивания актуальная версия программного обеспечения, поэтому зачастую переустановка таких приложений позволяет избавиться от некоторых проблем или ошибок в работе софта.
Если в вашей сборке Windows (касается нелицензионных копий от сборщиков) изначально отсутствует «Защитник», вернуть его не получится никаким образом.
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This PowerShell command reinstalls Windows Defender in seconds
Updated on September 22, 2022
What to Know
- You don’t need to download Windows Defender, because it’s integrated into Windows 11.
- Enter this in a PowerShell window: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage.
- Or, go to Settings > Apps > Installed apps > Windows Security > three dots > Advanced options > Reset.
This article explains when and how to reinstall Windows Defender through the command line or Settings app in Windows 11.
How to Reinstall Windows Defender in Windows 11
Windows Defender (aka, Microsoft Defender) isn’t installed on your computer like a typical program, so you can’t reinstall it like you can regular software. Instead, follow these directions to use a PowerShell command to get the job done. It might take anywhere from 5 seconds to a few minutes to complete. If you can open Settings normally, there’s an easier method after these steps.
-
Right-click the Start button and select Terminal (Admin).
If that doesn’t work for whatever reason, use the search bar on the taskbar to search for PowerShell, and then right-click it to find the Run as administrator option.
-
Copy the command exactly as it’s shown here, and then right-click in the PowerShell window to paste it (Ctrl+V works, too):
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage -
Press Enter to immediately start the process to reset Windows Defender to its original settings so that it performs as a freshly installed app.
-
You’ll know when it’s finished because you’ll see the blinking cursor again on a new line below the command you entered. In the meantime, you might briefly see a Deployment operation progress message.
If you see lots of red text, and an «Access is denied» message, return to step 1 and make sure you’re opening PowerShell as an administrator.
Another way to reset Windows Defender is through Settings. If Settings opens fine for you, you don’t need to bother with a PowerShell command. Instead, go to Settings > Apps > Installed apps > Windows Security > three dots > Advanced options > Reset.
When to Reinstall Windows Defender
Technically, you’re not really reinstalling the program because Windows doesn’t actually let you uninstall it. That said, you might run the above command to reset Windows Defender if it’s just not working correctly.
The most obvious sign you need to do this is if you see an error when you try to open it. If it’s not opening as it should, and you see this message, the above command should fix it right away:
You'll need a new app to open this windowsdefender linkLook for an app in the Microsoft Store
Or, maybe it does open, but some of its toggles won’t turn on or off, or you can’t even find a link to it on your computer. In these cases, the PowerShell command should refresh the tool back to working order.
Windows Defender Might Just Be Off
It’s possible that you’ve considered reinstalling Windows Defender because it isn’t catching malware, when in reality, it’s just not turned on. You might think it’s been uninstalled or is broken, but really it’s just disabled.
This is completely possible since Windows 11 lets you turn off its built-in antivirus program if you’d rather not use it.
Learn how to turn Windows Defender on and off for specific directions.
FAQ
-
Not really. While Windows Defender provides basic protection from threats, it’s no substitute for third-party antivirus software.
-
Go to Start > Settings > Privacy & Security > Windows Security > Virus & threat protection. Under Virus & Threat Protection Settings, select Manage settings, then under Exclusions, select Add or remove exclusions.
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You must Reinstall Windows Defender Firewall when it stops functioning the way it should. Without firewall working, your PC is more open to threats and viruses. So, the best way to make firewall work is to reinstall it completely. You may like to Turn On / Off Firewall & Network Protection on Windows 10.
Many times, when a PC gets infected, the malware or virus change the firewall settings, which in turn makes this integrated security tool non-operable. Also, in some cases, users try to configure firewall settings and end up messing everything. Therefore, if firewall stops working on your PC for varying computer reasons, then quickly Reinstall Windows Defender Firewall.
But to do so, you have to run few commands one after the other in an elevated Command Prompt. Hence, let us head towards the steps and see the method of reinstalling firewall.
Follow Windows 10 Tips to Run a Program Using Administrator Privilege to know more.
How to Reinstall Windows Defender Firewall in Windows 10
Step 1 – To Reinstall Windows Defender Firewall, open Start Menu, and type cmd. This will show up Cortana with Command Prompt as the Best match. Simply, make a right-click on the result and choose the option namely Run as administrator.
In addition, you can also Launch Elevated Command Prompt on Windows 10 using more ways.
Step 2 – This action will launch UAC prompt on your PC screen, select Yes.
Step 3 – Copy-paste the below line of commands one by one to Reinstall Windows Defender Firewall in Windows 10. Well, make sure to press Enter after pasting every command to execute them
Recreate the Service
Rundll32 setupapi,InstallHinfSection Ndi-Steelhead 132 %windir%\inf\netrass.inf
Start Windows Defender Firewall Service
sc start mpssvc
Reset Windows Defender Firewall Configurations
netsh advfirewall reset
netsh advfirewall set domainprofile state on
netsh advfirewall set privateprofile state on
Step 4 – After running all the above commands perfectly, it’s time to Restart Windows 10 PC. Restarting the PC will successfully Reinstall Windows Defender Firewall in Windows 10.
Conclusion
So, hopefully, by following the above simple series of commands you will be able to Reinstall Windows Defender Firewall. Well, you all know that without firewall functioning properly, there are chances for your PC to get infected. Though Microsoft is developing things quite frequently, you also need to take care of your PC at the same time. In case, you have any other way of reinstalling this specific security of Windows 10, write down to us.
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XINSTALL BY CLICKING THE DOWNLOAD
FILE
Windows 11 has its antivirus, but if it encounters issues, you might need to reinstall Windows Security on Windows 11, and this guide will show you a few ways to do it
How do I reinstall Windows Defender in Windows 11?
1. Use Windows PowerShell
- Right-click on the Start button and select Windows Terminal (Admin) from the menu.
- Copy and paste the below command in the Terminal and hit Enter:
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
- Once the command is successfully executed and it generates the success message, exit the Terminal.
Alternatively, you can use the following command instead: PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage WindowsDefender).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register -ForceApplicationShutdown $manifest}
Using these commands, you should be able to repair Windows Security in Windows 11.
2. Reset Windows Security via Settings
- Press the Windows key + X and select Apps and Features.
- Locate Windows Security, click the three dots next to it, and choose Advanced options.
- Next, click on Reset and click Reset again to confirm.
How do I reset Windows Security in Windows 11?
You can achieve this from the Settings app, by following the guides from Solution 2 of this guide.
- Microsoft Defender will allow SOC teams and admins to refine the threat detection process
- How to Delete Windows 11 Saved Passwords
- How to Download DirectX 12 Agility SDK [Installation Guide]
- How to Open PPTX File in Windows 11? Use These 4 Ways
You can try these methods if Windows Security is not opening in Windows 11 or if Windows Defender is missing. However, if the problem persists, your only option might be to reset Windows 11 or use a different antivirus software.
As for other issues, we wrote a guide on what to do if Windows Defender turns off on Windows 11, so don’t miss it for more information.
What method do you use to reinstall Windows Defender on Windows 11? Let us know in the comments section below.
Madhuparna Roy
A diploma holder in computers and with a keen interest in technology, Madhuparna is passionate about writing How-to guides and helping people solve the most intricate Windows issues.
It all started with the evolution of mobile phones and Google, and that has now settled with Windows.
Here’s a guide for Microsoft/Windows Defender download, install, uninstall and reinstall on Windows 10/11. Utilize this best free antivirus software for Windows to protect your computer from threats. For more computer troubleshooting tips, you can visit MiniTool Software official website.
This post mainly introduces how to download Windows Defender on Windows 10/11 computer. 3 ways are offered to let you get the Microsoft Defender app. You can also learn how to uninstall and reinstall Windows Defender on Windows 10/11, how to fix Windows Defender can’t open/start issue, how to recover deleted or lost files from your PC, etc.
Also read: Learn the best tips and tricks for data recovery hard drive on Windows 11/10/8/7.
About Windows Defender
Windows Defender, also known as Microsoft Defender or Windows Security, is a 100% free antivirus program developed by Microsoft. It is included in Windows 11/10/8/8.1/7/Vista.
Windows Defender offers 4 scan modes: full scan, quick scan, custom scan, and offline scan.
Users can open Windows Defender on Windows 10/11 and turn on or off the real-time protection, enable or disable firewall & network protection, change the automatic scanning settings, adjust the advanced protection settings, and more.
Check for more information about how to stay protected with Windows Security.
How to Download and Install Windows Defender on Windows 10/11
Windows Defender is automatically installed for free on all PCs that run on Windows 11/10/8/7. If you can’t find Windows Defender on your computer, generally, you have 3 ways to get Windows Defender.
Way 1. Update Windows OS
You can try to update Windows 11/10 to the latest version to see if Windows Defender comes back.
To update your system, you can click Start -> Settings -> Update & Security (Privacy & Security) -> Windows Update -> Check for updates. You can also use this way to update Windows Defender to the latest version on Windows 10/11.
Way 2. Manually Download and Install Windows Defender on Windows 10/11
- Open Microsoft Store on your Windows computer. For Windows 11, you can click the Microsoft Store icon on the taskbar to open it. You can also press Windows + S, search for Microsoft Store in the search box, and click the Microsoft Store app to open it.
- In Microsoft Store, you can type Microsoft Defender Preview in the search box, and choose the Microsoft Defender Preview app.
- Click the Get button or Get in Store app button to download Microsoft Defender for Windows 10 or 11.
Way 3. Find Third-party Windows Defender Download Websites
You may also find some third-party reliable websites to get Microsoft Defender. Some websites are listed below for your reference, but you should identify by yourself if the Windows Defender download resource is reliable.
- https://windows-defender.en.softonic.com/download
- https://downloads.digitaltrends.com/windows-defender/windows
- https://www.filehorse.com/download-windows-defender-64/
- https://download.cnet.com/Microsoft-Windows-Defender/3000-8022_4-55082.html
Related: How to Enable or Disable Microsoft Defender in Windows 11
Download Microsoft Defender for Android from Google Play Store
If you want to download Microsoft Defender for Android, you can open the Play Store on your device, search for Microsoft Defender, and tap the Install button to download and install Microsoft Defender for your Android phone or tablet.
How to Uninstall and Reinstall Windows Defender on Windows 10/11
If you want to uninstall the built-in Windows Defender app on Windows 10/11, you may need to use Windows PowerShell to do it. You may refer to this post: How to Uninstall, Restore, Reinstall Windows 10 Built-in Apps.
If you download and install Microsoft Defender from Microsoft Store or other third-party websites, you can open Control Panel on Windows, right-click the Microsoft Defender app and select Uninstall to remove it from your computer.
After you uninstall Windows Defender, you can follow the instructions above to reinstall Windows Defender if you want.
Fix Windows Defender Can’t Open/Start on Windows 10/11
If you can’t open Windows Defender on your computer, you may try the 10 tips below to see if they can help bring this free antivirus app back to normal working.
Fix 1. Restart your computer and try to open Windows Defender again.
Fix 2. Update Windows system.
You can follow the guide above to update your Windows 10 or 11 OS to see if Windows Security can work normally again.
Fix 3. Run SFC scan.
You can perform a system scan to repair possible corrupted system files in your device.
- Press Windows + R, type cmd, and press Ctrl + Shift + Enter to open Windows Command Prompt.
- Type sfc /scannow command and press Enter to run the SFC tool to automatically check and fix corrupted system files. If this command doesn’t work, you can type DISM /Online /Cleanup-image /RestoreHealth command and press Enter to run this command first.
Fix 4. Reset Windows Defender app.
If Windows Defender is not working well on your computer, you can follow the operation below to reset the app settings to default to see if it helps.
- Press Windows + X and select Windows PowerShell (Admin). For Windows 11, select Windows Terminal (Admin).
- Type the command: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage. Press Enter to execute the command.
Fix 5. Uninstall and reinstall Windows Defender. The instructions are introduced above.
Fix 6. Disable any third-party antivirus software on your computer since it may be conflicted with the Windows Defender antivirus program.
Fix 7. Use third-party antivirus software.
If Windows Defender has problems or can’t work on your computer, you can turn to some third-party top free antivirus software for Windows 10/11.
Fix 8. Start Windows in Safe Mode to see if Windows Defender can smoothly open and work.
Fix 9. Perform a System Restore. If you still favor Windows Defender and do not want to use other antivirus applications, you can try to restore your Windows system to a previous state to see if the Windows Security app can work properly.
Fix 10. If Windows Defender is not working and you have some other problems on your computer, you may reinstall your Windows OS.
Note: Before you perform the system restore or reinstall your computer, it’s highly advised you make a backup of your Windows system and important data.
How to Recover Deleted/Lost Files on Windows 10/11 for Free
If your computer has problems and you lost some important data, you can try a professional data recovery program to restore the lost data from your PC.
MiniTool Power Data Recovery is a top data recovery program that helps you recover data from various data loss situations. You can use it to recover permanently deleted files, recover data from a corrupted/formatted hard drive, recover data after malware/virus infection, recover data when the PC won’t boot, and more. Unless the hard drive is physically damaged and can’t be recognized by your computer, you can try this tool to restore data.
As for supported devices, you can use MiniTool Power Data Recovery to recover any deleted/lost files from a Windows PC or laptop, USB flash drive, memory card, external hard drive, SSD, etc.
Download and install MiniTool Power Data Recovery on your Windows PC or laptop, and check the guide below for how to use it to recover data.
MiniTool Power Data Recovery FreeClick to Download100%Clean & Safe
- Launch MiniTool Power Data Recovery to access its main interface.
- On the main UI, you can choose the drive or device you want to scan. If you know which drive contains your deleted/lost files, you can select the target drive under Logical Drives and click Scan. If you don’t know which drive to scan, you can click the Devices tab, select the whole disk or device and click Scan. For an external device, you need to connect it to your Windows computer beforehand.
- Let the software finish the scan. After that, you can check the scan result and find if the target files are listed, if so, check those files and click the Save Then you can choose a preferred new location to store the recovered files.
Tip: If you only want to scan a specific type of file, you can click the Scan Settings icon in the left panel of the main UI and choose the file types you want to scan.
Free Disk Partition Manager for Windows 11/10/8/7
If your computer has problems or you reinstalled your OS, you may need a professional disk partition manager to repartition the hard disk or manage the hard drives from other aspects.
MiniTool Partition Wizard is a popular free hard drive partition manager for Windows. It lets you manage hard drives and partitions from all aspects.
For partition management, you can use it to create, delete, extend, resize, split, merge, format, wipe partitions, convert partition format, check file system errors, change the drive letter, and more.
For disk management, you can use MiniTool Partition Wizard to migrate OS to SSD/HD, copy disk, recover lost partitions, convert disk format, wipe disk, test hard drive speed, analyze hard drive space, and more.
This disk partition manager is extremely easy to use and fulfills all your hard disk management needs. It is free and clean. You can download and install MiniTool Partition Wizard on your Windows PC or laptop to test it now.
MiniTool Partition Wizard FreeClick to Download100%Clean & Safe
Free PC Backup Software for Windows 10/11
For system and data backup on a PC, you can utilize a professional free PC backup tool.
MiniTool ShadowMaker is one of the best free PC backup utilities that supports Windows system backup and file backup.
You can use it to easily create a system image backup of your Windows OS and restore your OS from the backups when needed.
As a professional PC backup application, you can also use it to back up any files on your computer at a fast speed. You can easily select files, folders, or partitions to back up to external hard drives or USB flash drives. You can even select the whole disk content to back up.
Besides, it also offers another backup module: File Sync. You can easily sync data to the target device to make a backup.
Many other backup features are provided, e.g. disk clone, automatic backup, incremental backup, etc.
Use this top free PC backup tool to keep your computer data safe.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
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Conclusion
This post offers a guide for Windows Defender download, install, uninstall, and reinstall on Windows 10/11. Some tips to help you fix Windows Defender not working or can’t open problem are also provided. Some useful free Windows tools are offered to help you with data recovery, system and data backup, and disk partition management. Hope it helps.
If you have any problems with using MiniTool Software products, you can contact [email protected].