System File Checker (SFC) is a tool built into Windows that will check for system file corruption.
The SFC /SCANNOW command scans and verifies the integrity of all protected system files and replaces missing or corrupted versions with correct versions when possible. If this command discovers that a protected file has been overwritten, it retrieves the correct version of the file from the Windows image component store, and then replaces the missing or corrupted file.
This tutorial will show you how to run the System File Checker (SFC) tool to repair missing, corrupted, and modified system files in Windows 11.