Windows Defender Troubleshooting Checklist
Windows Defender (now Microsoft Defender Antivirus) usually runs quietly in the background, but s...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix PowerShell 404 Not Found Error
When you see a 404 Not Found error in PowerShell, it usually means something the command tried to...
Enable Windows Security Manually When It Fails to Start
If Windows Security (formerly Windows Defender) fails to start, you may see an error like "This a...
Fix OneDrive Sync Service Unavailable on Windows 10
You open OneDrive and see 'Sync service unavailable' with no files syncing. This usually means th...
Fix Chrome ERR_TUNNEL_CONNECTION_FAILED When Using VPN
You're browsing with Chrome and your VPN is on, but suddenly pages won't load and you see
Fix Windows Defender DNS Error 0x800704cf
You open Windows Defender and see error code 0x800704cf. This usually means Windows Defender can’...
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