Fix Windows Defender 404 Not Found Error on Windows 10
You click to open Windows Defender Security Center and see a 404 page, or the Settings app shows ...
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Windows Defender error 504 typically appears when the security service fails to start or update. ...
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Fix 'Service Unavailable' in PowerShell
Docker Restart Policy Troubleshooting
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How to Reinstall the Windows Security Module
Windows Defender Real-Time Protection Off but Still Scanning: Fix