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.
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