System File Checker

There is a command-line utility called System File Checker (SFC.EXe), which allows an administrator to scan all protected files to verify their versions.

The following shows the command-line syntax:

/SCANNOW Scans all protected system files immediately.
/SCANONCE Scans all protected system files once at the next boot.
/SCANBOOT Scans all protected system files at every boot.
/CANCEL Cancels all pending scans of protected system files.
/QUIET Replaces all incorrect file versions without prompting the user.
/ENABLE Enables Windows File Protection for normal operation
/PURGECACHE Purges the file cache and scans all protected system files immediately.
/CACHESIZE=x Sets the file cache size