Note: System File Checker gives an administrator the ability to scan all protected files to verify their versions. If System File Checker discovers that a protected file has been overwritten, it retrieves the correct version of the file from the cache
folder (%Systemroot%\System32\Dllcache) or the Windows installation source files, and then replaces the incorrect file. System File Checker also checks and repopulates the cache folder. You must be logged on as an administrator or as a member of the Administrators
group to run System File Checker. If the cache folder becomes damaged or unusable, you can use the
sfc /scannow, the sfc /scanonce, or the sfc /scanboot commands to repair its contents.
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Last updated: December 21, 2017