Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

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Fix Windows Activation Blocked by Firewall

If Windows activation fails with an error about a blocked firewall, your PC likely can't reach Mi...

Fix Windows Activation Rate Limit Error Without Product Key

You're trying to activate Windows, but you keep seeing a rate limit error. This usually means you...

Fix Windows Search Error 0x80070490: Version Mismatch

If you see error 0x80070490 when searching in Windows, it usually means a component version misma...

Fix OneDrive Error 0x8007016a Not Syncing

You see OneDrive error 0x8007016a and your files stop syncing. Usually this means OneDrive can't ...

Fix Firefox 'Profile Missing Permission Denied' Error

When you start Firefox and see an error like “Your Firefox profile cannot be loaded. It may b...

Windows Defender Connection Refused: Troubleshooting Checklist
You open Windows Security and see "Connection refused" or "Something went wrong. Try reopening Wi...