How to check and fix corrupted Windows system files

How to check and fix corrupted Windows system files

 

Corrupt Windows system files can slow down the computer and cause other problems. System File Checker (SFC) is a utility in Windows that scans for corrupted system files. If SFC finds a problem, it tries to replace the problem files from a cached version on your computer.

If System File Checker cannot replace the corrupt files, use the Deployment Image Service and Management Tool (DISM). DISM checks the corrupted files, then downloads and replaces the files through Windows Update.

Use the following instructions to run System File Checker.

  1. In Windows, search for Command Prompt. In the search results, right-click Command Prompt and select Run as administrator. Then click Yes. Or right click the start button and select Windows PowerShell (admin).
  2. In Command Prompt/PowerShell, type sfc /scannow or copy and paste from here into the Command Prompt window. Make sure to include the space between sfc and the / if typing in the command manually.

Press Enter and wait while System File Checker scans for corrupted files.

Figure : Running System File Checker

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  1. When scanning is complete, the results are displayed on the screen.
    • If the file checker found and replaced any corrupted files, restart the computer and check the performance.
    • If the file checker did not find any corrupted files or found corrupted files but could not replace them, go to the next step.
  • If System File Checker finds corrupted files but cannot replace them, use the Deployment Image Servicing and Management (DISM) tool. DISM checks the corrupted files; then downloads and replaces the files using Windows Update.

   NOTE:

You need to be connected to the Internet to use DISM.

  • In Windows, search for Command Prompt. In the search results, right-click Command Prompt and select Run as administrator. Then click Yes. Or right click the start button and select Windows PowerShell (admin).
  • In Command Prompt/PowerShell, type dism.exe /Online /Cleanup-image /Restorehealth or copy and paste from here into the window. If typing in manually make sure to include the space before each /in the command line.

Press Enter and wait while DISM works. It can appear to be doing nothing – be patient. This might take several minutes.

Figure : Running DISM

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  • If DISM finds corrupted files, it replaces them using Windows Update. If this occurs, after DISM is finished, restart your computer and see if the performance has improved.

These steps are for Windows 10

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