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أولا مشكور على الموضوع الجيد ولكن لدي التعقيب التالي -اذا سمحت طبعا-:
هذا الامر تنفذه عندما تشك أن الوندوز حصلت في احدى ملفاته عطب ما وتعرف ذلك من كثرة الاخطاءErrors أو بثقل الجهاز بدون ان يكون مصابا بفايروس أكيد وشرح المر بالكامل كالتالي:
SFC(System File Cheker)it:
Scans and verifies the versions of all protected system files after you restart your computer.
Syntax
sfc [/scannow] [/scanonce] [/scanboot] [/revert] [/purgecache] [/cachesize=x]

Parameters
/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.

/? : Displays help at the command prompt.

Hints:
You must be logged on as a member of the Administrators group to run sfc.

• If sfc discovers that a protected file has been overwritten, it retrieves the correct version of the file from the %systemroot%\system32\dllcache folder, and then replaces the incorrect file.

• If the %systemroot%\system32\dllcache folder becomes corrupt or unusable, use sfc /scannow, sfc /scanonce, or sfc /scanboot to repair the contents of the Dllcache directory.