Fix 'Windows Security App Not Installed' on Windows 10
You open the Start menu, search for Windows Security, and nothing shows up. Or you see a message ...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labWindows Activation Troubleshooting Checklist: Step by Step
Windows activation errors can appear suddenly—often after a hardware change, update, or network d...
Fix Command Prompt Crashing with SFC and DISM
When Command Prompt crashes during SFC /scannow or DISM operations, it usually means a system fil...
Fix Microsoft Teams Guest Access Denied Error
You've been invited to a Microsoft Teams team as a guest, but when you try to join, you see an "A...
Windows Security Not Scanning for Viruses: How to Fix
If Windows Security (formerly Windows Defender) is not scanning for viruses, you may see an error...
Windows Security Token Expired: Troubleshooting Checklist
When you see a message that your Windows security token has expired, it usually means you can't a...