How to Use the Microsoft System File Checker (SFC)
Written by Michael Cone
Updated at February 4th, 2026
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The Microsoft System File Checker tool is helpful if some Windows functions aren't working or Windows crashes.
Note: Using "sfc / scannow" takes several minutes to complete.
If the SFC files corrupted files, it will report if it was able to fix them:
For more information, see this page.