Check if Microsoft Windows Defender does not start on Windows 10 issue still occurs. Method 9: Reset PC This is considered to be the last resort when the above mentioned fails to fix the issue.

We show you how to fix the Windows Defender History crashes and what you can do if you can't delete detections.log on your Windows computer.

Fix Windows Defender Error code: 0x8050800c, An unexpected problem occurred, Install any available updates, and then try to start the program again.