Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If files aren't syncing, icons are stuck, or you see error messages, this checklist walks you thr...

If you see a message that your Chrome profile failed to authenticate—often when trying to sync or...

If Windows Security (formerly Windows Defender) is not scanning for viruses, you may see an error...

Outlook can fail in many ways—crashing on startup, stuck on "Loading Profile," not sending emails...

You run npm install and get a wall of red text about unmet peer dependencies or conf...

You try to update Windows Defender, but it fails with error 0x80240022. This usually means Window...