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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. If a Windows Resource Protection (WRP) file is missing or is corrupted, Windows may not behave as expected. For example, some Windows functions may not work, or Windows may crash.
Run the System File Checker tool (SFC.exe)
To do this, follow these steps:
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.
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.
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.
Download Troubleshooter
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. If a Windows Resource Protection (WRP) file is missing or is corrupted, Windows may not behave as expected. For example, some Windows functions may not work, or Windows may crash.
Run the System File Checker tool (SFC.exe)
To do this, follow these steps:
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.
At the command prompt, type the following command, and then press ENTER:
sfc /scannow
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.
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.
Use a fix-it tool with Windows 10
Fix-it tools aren’t used in Windows 10. Instead, use a troubleshooter to help solve problems with
your PC.
your PC.
- To find all of the troubleshooters, select the Start button, then type troubleshooting in the
search box next to the Start button on the taskbar. Open the Troubleshooting control panel and choose View all from the left pane. 
