Run System File Checker in Safe Mode, Boot Time or Offline on Windows 10

In this post, we will see how to run System File Checker in Safe Mode, Offline or at Boot-Time in Windows 10/8.1. This is useful if SFC will not run or start. One of the useful tool Microsoft introduced on Windows, is the ability to run system file checker to check the stability of core system files. We have discussed the System File Checker earlier. One of the most effective ways to run this tool or SFC is to run in Safe Mode or at boot-time. This may be an option you may want to consider if you find that your system file checker run does not complete successfully. At boot time, system files won’t be connected to any other Windows services so it could be easier for the to complete its run successfully and replace the files.

Run System File Checker in Safe Mode

Simply boot in Safe Mode, open an elevated command prompt, type sfc/scannow, and hit Enter. System File Checker will run in Safe Mode too.

Run System File Checker at Boot

On Windows XP we have a command called sfc /scanboot. It scans all protected system files every time the computer is booted. Running sfc /scanonce would run it once only at the next reboot. Unfortunately, these commands have been removed on later versions of Windows. So in order to run this command, we have to go to Windows RE and run it from here. We can also call it Run Offline System File Checker.

Run Offline System File Checker

To execute this run, do the following:

Insert the Windows installation disc or USB flash drive, or a system repair disc, and then shut down your computer. Then restart your Computer When prompted, press any key, and then follow the instructions that appear.

On the Install Windows page, or the System Recovery Options page, choose your language and other preferences, and then click Next.


Click Repair your computer.

Select the Windows installation you want to repair, and then click next.


On the System Recovery Options menu


Click on Command prompt, then type in the following command and hit Enter:

sfc /scannow /offbootdir=d:\ /offwindir=d:\windows

Refer to the second image above. I have used D, since the Windows drive is D.

Once it has completed the repair, type Exit and then reboot the system. In case the command does work or if the Windows failed to repair, then you need to run a Repair Windows 7 or Refresh Windows 8 or Reset Windows 10 to fix those corrupted files.

I hope you found this article helpful. In the case of any issues, please feel free to drop a message in our commands section.

This post will show you how to how to Run sfc /scannow System File Checker on External Drives.

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Shyam aka “Captain Jack” is a Microsoft MVP alumnus and a Windows Enthusiast with an interest in Advanced Windows troubleshooting. Suggestions made and opinions expressed by him here are his personal one's and not of his current employers. He blogs at