Windows Defender (error code- 0x800b0100)

Lately my system had not been performing up to the mark and I suspected it had been infected with malwares. So I decided to run a scan via Windows Defender but it didn't open and showed this errorImage
Usually, when Windows Defender is not working, the best way to fix it is to perform a repair upgrade.

See steps how to do that:

http://answers.microsoft.com/en-us/insider/wiki...

Other steps you can also try:

Try these first to see if they work:

Open Start, type: CMD
Right click CMD
Click Run as administrator

Type in at the prompt OR Copy and Paste these one at a time : (Hit enter after each)

Dism /Online /Cleanup-Image /CheckHealth

Dism /Online /Cleanup-Image /ScanHealth

Dism /Online /Cleanup-Image /RestoreHealth

Also run the System File Checker utility:
Open Start, type: CMD
Right click CMD
Click Run as administrator

At the Command Prompt, type: sfc/scannow

This will check for any integrity violations

Restart your system
Best regards,
Andre Da Costa
Independent Advisor for Directly

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Last updated April 19, 2025 Views 4,285 Applies to: