Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If Windows Defender (Microsoft Defender Antivirus) is missing, disabled, or not working correctly...

After a Windows update, Outlook may stop receiving new emails while still sending or showing old ...

You open Outlook for Mac, and it sits on the loading profile screen for minutes—or indefinitely. ...

You try to open a file with 7-Zip and get the error: “Cannot open the file as archive”. ...

If Chrome shows an error saying it's unable to open your profile, you can't access bookmarks, his...

If you see a 504 Gateway Timeout error, it usually means a server upstream (like a proxy or gatew...