Fix 'Security Module Not Found' in Windows Defender
If you see a message in Windows Security that says something like "Security module not found" or ...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labHow to Fix Windows Defender Service Not Running
If you see a message that Windows Defender is not running or the security center shows it's off, ...
Fix Microsoft Store Permission Denied Without Admin Rights
You try to install an app from the Microsoft Store, but get a 'permission denied' error and you d...
Fix Windows Defender Login Loop: Step-by-Step Guide
You sign in to Windows, but Windows Defender keeps asking for credentials in a loop. This guide c...
Fix Windows Update Error 0x80070002 Permission Denied
If you see error 0x80070002 with a "permission denied" message when running Windows Update, it us...
Fix Windows Defender Network Error After Update
After a Windows Update, you might see a network error in Windows Defender, often with a message l...