If Windows 11 is sending alerts that you need to turn on virus protection and your PC is unprotected, don't worry.
If your PC is off during a scheduled Windows Security scan, it'll get skipped. Use this simple registry tweak to force scans afterwards. Windows Security and its Defender antivirus component carries ...
A bad security intelligence update causes Microsoft Defender to crash during Full and Quick Scans on some PCs. Upgrading to Security Intelligence Update v1.457.236.0 resolves the issue.