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 Version Mismatch on Windows 10
You might see an error saying Windows Defender has a version mismatch, or the app won't open beca...
How to Fix Windows Security High CPU Usage
If your PC feels sluggish and Task Manager shows Windows Security (or Antimalware Service Executa...
Fix Windows Defender Malware Protection History Not Showing
You open Windows Security to review past malware detections, but the protection history section i...
Fix OneDrive Sync Service Unavailable on Windows 10
You open OneDrive and see 'Sync service unavailable' with no files syncing. This usually means th...
Command Prompt Opens and Closes Immediately: Fixes
You double-click Command Prompt (cmd.exe) and a black window flashes on screen—then disappears. T...