SFC.exe – Windows CMD Command
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System File Checker
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Syntax Sfc [/Scannow] [/Scanonce] [/Scanboot] [/Revert] [/Purgecache] [/Cachesize=x] Key /Scannow Scan all protected system files immediately and replace incorrect versions with correct Microsoft versions. May require access to the Windows installation source files. /Scanonce Scan all protected system files one time when you restart your computer. May require access to the Windows installation source files when you restart the computer. The SfcScan DWORD value is set to 2 in the following registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon /Scanboot Scan all protected system files every time you start your computer. May require access to the Windows installation source files every time you start the computer. The SfcScan DWORD value is set to 1 in the following registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon /Revert Return scan to the default setting (do not scan protected files when you start the computer). The default cache size is not reset when you run this command. /Purgecache Purge the file cache and scan all protected system files immediately. May require access to the Windows installation source files. /Cachesize=x Set the file cache size to x megabytes (MB). The default size of the cache is 50 MB. This command requires you to restart the computer, and then run the /purgecache command to adjust the size of the on-disk cache. This command sets the SfcQuota DWORD value to x in the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon |
SFC must be run from an elevated command prompt.
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