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How to Fix sfc /scannow Error on Windows 11: Complete Troubleshooting Steps

The sfc /scannow command is a useful tool in Windows 11 that scans and repairs corrupted system files. Sometimes, while running this command, you may encounter errors that prevent it from completing successfully. This guide will help you understand how to fix those errors with simple and clear troubleshooting steps.

System file corruption can cause many problems, and sfc /scannow helps detect and fix them automatically. When errors occur, it usually means there are deeper issues that need attention.

Following these steps carefully will help you resolve common problems related to the sfc /scannow command. No advanced technical skills are required, and we will explain everything in a straightforward way.

Let’s begin with some quick checks before diving into the troubleshooting process.

Quick Note: Prerequisites and Initial Checks

Before starting, make sure you have the following ready:

  • Administrator Access: You must run commands with administrative privileges for sfc /scannow to work correctly.
  • Stable Power Supply: Ensure your PC is plugged in or has enough battery to avoid interruptions during the scan.
  • Internet Connection: Some fixes may require downloading files from Microsoft servers.
  • Close Unnecessary Apps: Running applications can interfere with system scans, so close all unneeded programs before starting.

Step 1: Run SFC Scan in Safe Mode

Sometimes, background apps or services can block the sfc /scannow command. Running Windows in Safe Mode disables most non-essential software, helping the scan complete successfully.

  1. Press Windows + I to open Settings.
  2. Go to System > Recovery.
  3. Under Advanced startup, click Restart now.
  4. After your PC restarts, choose Troubleshoot > Advanced options > Startup Settings > Restart.
  5. When your PC restarts again, press F4 to enter Safe Mode.
  6. Open Command Prompt as Administrator by searching for cmd, right-clicking it, and selecting Run as administrator.
  7. Type sfc /scannow and press Enter.

This method often helps bypass interference from other programs.

Step 2: Use the DISM Tool to Repair Windows Image

If sfc /scannow still gives errors, it might be because your system image is corrupted. The Deployment Image Servicing and Management (DISM) tool can fix this by repairing the Windows image used by SFC.

  1. Open Command Prompt as Administrator.
  2. Type the following command and press Enter:
DISM /Online /Cleanup-Image /RestoreHealth

This process can take several minutes. DISM will check and repair the system image online by connecting to Microsoft’s servers.

After it finishes, restart your computer, then run sfc /scannow again.

Step 3: Check and Fix Disk Errors

Disk errors can also cause issues with system file scanning. Running a disk check helps ensure your hard drive is healthy.

  1. Open Command Prompt as Administrator.
  2. Type the following command and press Enter:
chkdsk C: /f /r /x

Explanation of switches:

  • /f fixes errors on the disk.
  • /r locates bad sectors and recovers readable information.
  • /x forces the volume to dismount before scanning.

You will be prompted to schedule this check on the next restart. Press Y and restart your PC.

After the disk check completes, try running sfc /scannow again.

Step 4: Temporarily Disable Antivirus Software

Some antivirus programs may interfere with system scans. Temporarily disabling them can help determine if they are the cause of the error.

  • Locate your antivirus icon in the system tray (near the clock).
  • Right-click the icon and look for an option to disable or pause protection temporarily.
  • Disable the antivirus and run sfc /scannow again.
  • Remember to enable your antivirus protection after the scan.

If the scan works after disabling antivirus, consider adjusting your security software’s settings or contacting their support.

Step 5: Perform a System Restore

If you recently started experiencing sfc /scannow errors, restoring your system to an earlier point might fix the problem.

  1. Press Windows + R, type rstrui, and press Enter.
  2. Follow the System Restore wizard to select a restore point dated before the errors began.
  3. Complete the restoration process and restart your PC.
  4. Run sfc /scannow again after the system is restored.

This step helps if a recent change caused corruption or conflicts.

Alternative Method: Use Third-Party Repair Tools

If you find the above methods complicated or unsuccessful, some trusted third-party tools can help repair Windows system files automatically. Examples include:

  • Restoro – scans and repairs system issues.
  • Advanced System Repair – optimizes and fixes Windows errors.

Make sure to download these from official sources and use them cautiously.

Frequently Asked Questions (FAQs)

Why does sfc /scannow sometimes fail?

Failures usually happen because of corrupted system images, disk errors, interference from other programs, or hardware issues.

Can I run sfc /scannow multiple times?

Yes, you can run it multiple times. Sometimes running it again after repairs fixes additional errors.

Is it safe to disable antivirus during the scan?

Temporarily disabling antivirus is generally safe if you disconnect from the internet and re-enable it immediately after the scan.

What if DISM also fails?

If DISM fails, your system files or Windows image may be severely corrupted. Consider using Windows installation media to repair or reset your PC.

Does Safe Mode affect the scan results?

Running in Safe Mode reduces interference from other software, making scans more reliable.

When Nothing Works

If all troubleshooting steps fail, you can try the following final options:

  • Reset Windows 11: Use the Reset this PC feature from Settings > System > Recovery. This reinstalls Windows while keeping your personal files.
  • Use Windows Installation Media: Create a bootable USB with Microsoft’s Media Creation Tool to perform repair installations.
  • Contact Microsoft Support: Visit Microsoft Support for official help and guidance.

Remember to back up your important files before attempting major repairs.

Conclusion

Fixing sfc /scannow errors in Windows 11 involves a step-by-step approach, starting from running scans in Safe Mode to using advanced tools like DISM and checking disk health. Understanding why each step is important ensures you can troubleshoot effectively without confusion.

Always start with simple solutions and move to advanced options only if necessary. Keeping your system updated and regularly scanning for errors can prevent many issues. If in doubt, use system restore points or seek professional support to avoid data loss.

With patience and these clear instructions, you can fix most sfc /scannow errors and keep your Windows 11 PC running smoothly.

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