How to reinstall Windows defender

Hi,

Recently I've got into trouble.

when I click on the windows defender icon, the following picture appears:

Image

could you please tell me how I can fix this problem?

Hi Mohammad,

First, pls disinfect your PC by downloading Malwarebytes and running a full scan. 

Disinfect Windows 10 most thoroughly (2023) - Microsoft Community

After completing the Malwarebytes scan, download defender_diag.bat and run it as administrator.

 

The Batch file queries Defender-related settings/Policies and outputs the results to a log file. Upload this log to your OneDrive and share the link here.

 

Note: Before uploading the log to your OneDrive, edit the defender.log file and remove your Email ID if found.

______________________________________________________________________________________________________
Ramesh, Windows Shell MVP 2003-2012.
If this post resolves your issue, pls mark it as an Answer.

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Hello,

Try to reset Windows Security:

Let us know if this helps!

Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.

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Microsoft MVP (Windows IT Pro), since 2014 · Windows Insider MVP, since 2016 · Windows Help (www.kapilarya.com)

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Last updated April 17, 2025 Views 2,495 Applies to: