Using the System File Checker

Using the System File Checker

You can run the System File Checker to verify protected system files. 

Command line switches are:

sfc [/scannow] [/scanonce] [/scanboot] [/revert] [/purgecache] [/cachesize=x] 
/scannow - Scans all protected system files immediately. 
/scanonce - Scans all protected system files once. 
/scanboot - Scans all protected system files every time the computer is restarted. 
/revert - Returns the scan to its default operation. 
/purgecache - Purges the Windows File Protection file cache and scans all protected system files immediately. 
/cachesize=x - Sets the size, in MB, of the Windows File Protection file cache.