Checklists for software errors, setup, and tool workflows.

How to Reinstall the Windows Security App (Microsoft Defender)

If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...

Fix 'Port Already Allocated' Error in Windows Defender on Windows 10

You may see an error like "Windows Defender Firewall cannot use port X because it is already allo...

How to Fix PowerShell Failed to Start on Windows 10

When PowerShell fails to start on Windows 10, you may see an error message like "Windows PowerShe...

How to Fix Microsoft Store 404 Error Code

When you open Microsoft Store and see a 404 error, the app usually fails to load content or shows...

How to Reinstall Windows Defender in Windows 10

Windows Defender (now called Microsoft Defender Antivirus) is built into Windows 10 and typically...

Fix Microsoft Teams Microphone Not Detected in Windows

Common Causes

• Microphone permissions disabled for Teams in Windows settings.