If the issue persists, disable your third-party firewall, anti-malware tool, and so on. It’s best to turn off any third-party antivirus apps you may be using. Disable and Uninstall Third-Party Security ToolsĪs a quick reminder, you can’t run two different antivirus solutions on your system. Alternatively, you can also clean boot your computer to ensure nothing’s interfering with Windows’ built-in security solution. Some of them might be interfering with Windows Security. Launch the Task Manager and force-stop all the unnecessary processes running in the background. Restart your computer and check if the issue is gone.Run the Dism/Online/Cleanup-Image/RestoreHealth command as well.Wait until the SFC tool scans your system. Right-click on Command Prompt and select Run as administrator.Click on the Search icon and enter cmd in the Search field.Use the System File Checker and Deployment Image Servicing and Management tools to detect and repair faulty system files automatically. If your system files got corrupted, specific built-in Windows 11 components, such as Windows Security, may stop working. Then close the PowerShell window and check the results. Launch PowerShell with admin rights and run the following command: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage. You can also use PowerShell to reset your Windows Security app package. If the issue persists, hit the Reset button.

Click on the three dots and select Advanced options.Repair and Reset the Windows Security App How Do I Fix Windows Security Not Opening on Windows 11?

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