Learn how to run System File Checker in Safe Mode, Offline, Recovery Console, Boot Time in Windows 11/10. Useful if SFC will not run or start.

Learn how to Run sfc /scannow on External Drives to repair Windows. You can run System File Checker offline, if you are unable to boot into your computer.

Installing all available updates will sometimes correct various problems without you even needing to run the system file checker.

Starting today, Windows 10 users are finding that the /sfc scannow feature is no longer working and that it states it found, but could not fix, corrupted Windows Defender PowerShell files.