System File Checker
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.
“Oh, yes, I've learned from my mistakes and I'm sure I could repeat them exactly” ~ Sir Arthur Streeb-Greebling (aka Peter Cook)
Related:
SLMGR - Software Licensing Management.
MSINFO32 - Windows System Information.