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Fix Windows Security Not Launching After Malware Removal

After removing malware, Windows Security may fail to launch or show a blank window. This is often...

Fix 'Windows Update File Locked by Another Program' Error

When running Windows Update, you may see an error like "The file is locked by another program...

Fix Windows Security Authentication Failed in Remote Desktop
When you try to connect to a remote PC and see "Windows Security" followed by "Authentication fai...

BitLocker Recovery Key Not Accepted in Safe Mode Fix
If you've entered your BitLocker recovery key in Safe Mode and it's not being accepted, you're li...

How to Fix Windows Defender Blocked by Group Policy
When you try to open Windows Defender and see a message like "This app is blocked by group policy...

Fix Windows Security Module Service Not Running
You open Windows Security and see a message that the service isn't running. The shield icon in th...

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Troubleshooting Windows Security Authentication Error
Troubleshooting Nginx 502 Bad Gateway