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Now scroll to the Antivirus app, select it, and hit the Uninstall button.Then go to the Programs and Features section.Head over to the Start menu, search Control Panel, and open it.Moreover, if doing so does end up fixing the Defender not working in Windows 11, then you could proceed ahead and permanently delete the third-party antivirus from your PC. So in that case, it’s better to temporarily disable that third-party antivirus from your PC. If you have any third-party antivirus or firewall installed, then it might conflict with the Defender’s proper functionality. Finally, restart your PC and then verify if the issue of Defender not working in Windows 11 has been fixed or not.
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