If Windows Defender is missing and is gone or has disappeared in Windows 11/10, ... Reinstall using Windows Terminal, Check Group Policy settings or use System Restore point.

Microsoft Defender is a security program that comes included in Windows 10 and 11 OS. It has some robust security features that protect your system from malicious threats.

If Quick scan is not working in Windows Defender on Windows 11/10, follow these steps: ... The same Group Policy settings can be enabled or disabled using Registry Editor as well.

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