Windows Defender 404 Not Found: How to Fix Missing Interface - Stop Windows Defender Crashing from Antivirus Conflicts-Windows Defender Log Access Denied Fix

Updated 2026-06-13 15:54:22developer-tools

Windows Defender 404 Not Found: How to Fix Missing Interface - Stop Windows Defender Crashing from Antivirus Conflicts-Windows Defender Log Access Denied Fix

Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

Restart the affected app after changing permissions or configuration files.
Test the same workflow in a clean browser profile or a temporary user account.
Compare the result on another network if the error may be connection related.