How to Use the System File Checker tool to repair missing or corrupted system files?
System File Checker is a utility in Windows that allows
users to scan for corruptions in Windows system files and restore corrupted
files. This article describes how to run the System File Checker tool (SFC.exe)
to scan your system files and to repair missing or corrupted system files.
Run the System File Checker tool (SFC.exe)
To do this, follow these steps:
1. Open an elevated command prompt. To do this, do the
following as your appropriate:
Windows 8.1 or Windows 8
Swipe in from the right edge of the screen, and then tap Search.
Or, if you are using a mouse, point to the lower-right corner of the screen,
and then click Search. Type Command Prompt in the Search box,
right-click Command Prompt, and then click Run as
administrator. If you are prompted for an administrator password or for a
confirmation, type the password, or click Allow.
Windows 10, Windows 7, or Windows Vista
To do this, click Start, type Command
Prompt or cmd in the Search box, right-click Command
Prompt, and then click Run as administrator. If you are
prompted for an administrator password or for a confirmation, type the
password, or click Allow.
2. At the command prompt, type the following command, and
then press ENTER:
sfc /scannow
The sfc /scannow command will scan all
protected system files, and replace corrupted files with a cached copy that is
located in a compressed folder at %WinDir%\System32\dllcache.
The %WinDir% placeholder represents the Windows operating system folder. For example, C:\Windows.
Note Do not close this Command Prompt window until the verification is 100% complete. The scan results will be shown after this process is finished.
The %WinDir% placeholder represents the Windows operating system folder. For example, C:\Windows.
Note Do not close this Command Prompt window until the verification is 100% complete. The scan results will be shown after this process is finished.
3. After the process is finished, you may receive one of
the following messages:
* Windows Resource Protection did not find any
integrity violations.
This means that you do not have any missing or corrupted
system files.
* Windows Resource Protection could not perform the
requested operation.
To resolve this problem, perform the System File Checker
scan in safe mode, and make sure that the PendingDeletes and
PendingRenames folders exist under %WinDir%\WinSxS\Temp.
* Windows Resource Protection found corrupt files and
successfully repaired them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log.
* Windows Resource Protection found corrupt files but
was unable to fix some of them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log.
To repair the corrupted files manually, view details
of the System File Checker process to find the corrupted file, and then manually
replace the corrupted file with a known good copy of the file.
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