If Windows Security is not opening or working in Windows 11, then you can follow this guide to fix the problem. Use an admin account to do so.

If Windows Defender or Windows Security Quick scan is not working in Windows 11/10 you need to take these steps to resolve the issue.

Check if Microsoft Windows Defender does not start on Windows 10 issue still occurs. Method 9: Reset PC This is considered to be the last resort when the above mentioned fails to fix the issue.

Windows’ Update stopped Microsoft Defender for Endpoint to start, at least for some users. Are Windows 10 users affected?

A Windows Defender bug is reportedly negatively impacting the performance of Intel-based Windows 10 and Windows 11 PCs.

After a long wait of five years, Microsoft has finally fixed a bug in Windows Defender that was causing high CPU usage when Firefox was open. The issue had been affecting users since May 2018, and ...