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...
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1. Reproduce
2. Isolate
3. Apply
4. Verify
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View listHow to Fix Windows Defender Authentication Failed Error
If you see "Authentication failed" when opening Windows Defender or trying to run a scan, it usua...
Fix Windows Defender Antivirus Slowing Down Your PC
If your computer feels sluggish after a Windows update or suddenly lags during file operations, W...
Fix Windows Defender Service Not Starting with Permission Denied
If you see 'Windows Defender service not starting – permission denied' when trying to enable Micr...
How to Fix Windows Defender Stuck on Loading Screen
If Windows Defender (Microsoft Defender Antivirus) gets stuck on a loading screen or shows a blan...
Fix OBS Black Screen and Permission Denied on Windows 11
You launch OBS Studio on Windows 11, add a display capture or game capture source, and see only a...
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