sfc
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.
Syntax
sfc [/scannow] [/verifyonly] [/scanfile=<file>] [/verifyfile=<file>] [/offwindir=<offline windows directory> /offbootdir=<offline boot directory> /offlogfile=<log file path>]
Parameters
| Parameter | Description |
|---|---|
| /scannow | Scans the integrity of all protected system files and repairs files with problems when possible. |
| /verifyonly | Scans the integrity of all protected system files, without performing repairs. |
/scanfile <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