SFC (SFC /SCANNOW) Is Not Working on Windows | System File Checker (SFC) Scannow won't start
How To Fix "Windows Resource Protection could not start the repair service" Error On Windows
System File Checker (SFC) is a utility in Microsoft Windows that allows users to scan for and restore corruptions in Windows system files.
The sfc /scannow command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%\System32\dllcache.
The %WinDir% placeholder represents the Windows operating system folder.
For example, C:\Windows.