If Windows Defender is not functioning properly or is missing from your Windows 11/10 computer, you can reinstall it within a few minutes and without any technical skills.

Microsoft has released a special Defender update for Windows 11, Windows 10, and Windows Servers This update is meant to bring improved security and performance to Windows install images.

If you have a Microsoft 365 subscription, you can download the Defender app to access additional security features not available on Windows 11 or 10.