Windows Security App Not Opening After Update: Fixes
After a Windows update, the Security app may refuse to open—clicking the icon does nothing, or it...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labFix BitLocker Not Prompting for Password on Startup
If your BitLocker-encrypted drive no longer asks for a password when you start Windows, the drive...
Windows Defender Setup Checklist for New PC
When you set up a new PC, Windows Defender (now called Microsoft Defender Antivirus) is already a...
How to Fix 'Windows Security Blocked File from Opening' Error
You try to open a file, and Windows Security blocks it with a message like “Windows Security bloc...
Fix 'Not Recognized as Internal or External Command' Error
You type a command in Command Prompt and see "'command' is not recognized as an internal or exter...
How to Enable Command Prompt Auto Start on Startup in Windows
If you need Command Prompt to open automatically every time you log into Windows—for quick access...