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Table of Contents
1. Run SFC to Check for Corrupted System Files
2. Use DISM to Repair the Windows Image
Step 1: Check Health of the Image
Step 2: Scan for Component Store Corruption
Step 3: Fix Corruption (If Found)
3. Restart and Recheck
When These Tools Help Most
Final Notes
Home System Tutorial Windows Series How to use SFC and DISM to repair Windows

How to use SFC and DISM to repair Windows

Jul 31, 2025 am 07:55 AM
sfc DISM

Run sfc /scannow in an admin command prompt to check and repair corrupted system files; if it fails, proceed to DISM. 2. Use DISM /Online /Cleanup-Image /CheckHealth, then /ScanHealth, and finally /RestoreHealth to repair the Windows image, optionally using a local ISO source if update servers fail. 3. Restart the computer and run sfc /scannow again to ensure all issues are resolved, confirming system file integrity has been restored.

How to use SFC and DISM to repair Windows

If you're experiencing system file corruption or Windows instability, SFC (System File Checker) and DISM (Deployment Imaging Service and Management Tool) are two built-in tools that can help repair core system files. Here's how to use them properly.

How to use SFC and DISM to repair Windows

1. Run SFC to Check for Corrupted System Files

SFC scans and repairs protected system files. Start with this tool first.

Steps:

How to use SFC and DISM to repair Windows
  • Press Windows X and choose Command Prompt (Admin) or Windows Terminal (Admin).
  • Type the following command and press Enter:
    sfc /scannow
  • Wait for the scan to complete (can take 15–30 minutes). Do not interrupt it.
  • After it finishes:
    • If it says "No integrity violations", your system files are intact.
    • If it finds and fixes errors, restart your PC and check if the issue is resolved.
    • If it finds errors but can't fix them, proceed to DISM.

? Tip: If sfc /scannow fails repeatedly, that’s a sign deeper corruption may exist—time to use DISM.


2. Use DISM to Repair the Windows Image

DISM repairs the Windows component store, which SFC relies on. If SFC can't fix files, it's often because the source files themselves are damaged—DISM fixes that.

How to use SFC and DISM to repair Windows

Step 1: Check Health of the Image

Run this command in the same admin command prompt:

DISM /Online /Cleanup-Image /CheckHealth
  • This is a quick check to see if any corruption has been detected previously.

Step 2: Scan for Component Store Corruption

DISM /Online /Cleanup-Image /ScanHealth
  • This scans the image for corruption (faster than a full restore).

Step 3: Fix Corruption (If Found)

DISM /Online /Cleanup-Image /RestoreHealth
  • This downloads and replaces any corrupted files from Windows Update.
  • Can take 20–40 minutes. Make sure you have a stable internet connection.
  • Once complete, run sfc /scannow again to let SFC fix any remaining file issues now that the source is healthy.

?? Note: If DISM fails due to update server issues, you can try using a local Windows installation ISO as a source:

DISM /Online /Cleanup-Image /RestoreHealth /Source:wim:Z:\sources\install.wim:1 /LimitAccess

Replace Z: with the drive letter of your mounted Windows ISO.


3. Restart and Recheck

After running DISM and SFC:

  • Restart your computer.
  • Log in and run sfc /scannow one more time to confirm no issues remain.
  • If both tools report no problems, system file corruption should be resolved.

When These Tools Help Most

  • Random crashes or blue screens
  • Windows Update failures
  • System features not working (e.g., Settings app crashing)
  • "Windows Resource Protection found corrupt files" messages

Final Notes

  • Always run these tools as Administrator.
  • Be patient—these scans take time.
  • Keep your system connected to power and internet.
  • Back up important data before system repairs, just in case.

Basically, SFC fixes files, DISM fixes SFC. Use them together for best results.

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