SFC /Scanonce
Scans all protected system files once.
To scan the system files once, do the following
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Open Command Prompt (Be sure to open command prompt as administrator. The instructions for Command Prompt will tell you how to do that)
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Type SFC /scanonce (There is a space between the SFC and the /)
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Press Enter
NOTES:
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You must be logged on as member of the Administrators group to run sfc.
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If sfc discovers that a protected file has been overwritten, it retrieves the correct version of the file from %systemroot%system32\dllcache folder, and then replaces the incorrect file.
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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.