Fix Windows Defender Blank Screen in Safe Mode
You boot into Safe Mode to run a malware scan, but Windows Defender shows nothing—just a blank wh...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labFix Windows Update Stuck on 'Checking for Updates' Due to DNS
If Windows Update gets stuck on 'Checking for updates' for minutes or hours, DNS issues are a com...
Fix Windows Defender Sync Error 504 Gateway Timeout
If you see a "504 Gateway Timeout" error when Windows Defender tries to sync, it usually means th...
How to Fix Windows Activation SSL Certificate Error
When you see an SSL certificate error during Windows activation, it usually means the system can'...
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...
Fix Windows Security Auto-Start Not Working After Update
After a recent Windows update, you might notice that Windows Security (formerly Windows Defender)...