Scans and verifies the integrity of all protected system files and replaces incorrect versions with correct versions. If this command discovers that a protected file has been overwritten, it retrieves the correct version of the file from the systemroot\ folder, and then replaces the incorrect file.
Important
You must be logged on as a member of the Administrators group to run this command.
Syntaxsfc [/scannow] [/verifyonly] [/scanfile=<file>] [/verifyfile=<file>] [/offwindir=<offline windows directory> /offbootdir=<offline boot directory> /offlogfile=<log file path>]
<file> Scans the integrity of the specified file (full path and filename) and attempts to repair any problems if they're detected. /verifyfile <file> Verifies the integrity of the specified file (full path and filename), without performing repairs. /offwindir <offline windows directory> Specifies the location of the offline windows directory, for offline repair. /offbootdir <offline boot directory> Specifies the location of the offline boot directory for offline repair. /offlogfile=<log file path> Specifies a location to store the log file other than the default. /? Displays help at the command prompt. Examples
To verify the kernel32.dll file, type:
sfc /verifyfile=c:\windows\system32\kernel32.dll
To set up the offline repair of the kernel32.dll file with an offline boot directory set to D: and an offline windows directory set to D:\Windows, type:
sfc /scanfile=D:\windows\system32\kernel32.dll /offbootdir=D:\ /offwindir=d:\windows
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