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Re-install Windows Defender

lalajee 1,811 Reputation points
2024-10-07T15:37:50.2166667+00:00

I have corrupted Windows Defender on our machine.

How do I re-install or remove and re-add Defender.

I have try following

SFC /SCANNOW

DISM /Online /Cleanup-Image /StartComponentCleanup

DISM /Online /Cleanup-Image /RestoreHealth

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
11,695 questions
Not Monitored
Not Monitored
Tag not monitored by Microsoft.
39,611 questions
Windows 10 Security
Windows 10 Security
Windows 10: A Microsoft operating system that runs on personal computers and tablets.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
2,925 questions
Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
9,858 questions
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3 answers

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  1. CrazyKats 85 Reputation points
    2024-10-07T17:12:01.56+00:00

    Use WIN+X and select Command Prompt Admin (might be listed as Terminal).

    Add-AppxPackage -Register "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"

    
Exit Command Prompt and Restart your PC.
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  3. Ian Xue 37,541 Reputation points Microsoft Vendor
    2024-10-09T01:39:07.4133333+00:00

    Hi lalajee,

    Thanks for your post. 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 1. Manually Download and Install Windows Defender on Windows 10/11Microsoft Defender - Free download and install on Windows | Microsoft Store

    1. 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.
    2. In Microsoft Store, you can type Microsoft Defender Preview in the search box, and choose the Microsoft Defender Preview app.
    3. Click the Get button or Get in Store app button to download Microsoft Defender for Windows 10 or 11.

    Way 2. 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.

    Related: How to Enable or Disable Microsoft Defender in Windows 11

    Hi lalajee,

    Thanks for your post. 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 1. Manually Download and Install Windows Defender on Windows 10/11Microsoft Defender - Free download and install on Windows | Microsoft Store

    1. 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.
    2. In Microsoft Store, you can type Microsoft Defender Preview in the search box, and choose the Microsoft Defender Preview app.
    3. Click the Get button or Get in Store app button to download Microsoft Defender for Windows 10 or 11.

    Way 2. 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.

    Related: How to Enable or Disable Microsoft Defender in Windows 11

    Best Regards,

    Ian Xue

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