Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to delete a file, but Windows says it's open in another program. The file is locked, and ...

You try to install Windows updates but get error 0x80070020. This usually means another program o...

If you're seeing a 504 Gateway Timeout error in Outlook, it usually means the server didn't respo...

If you see a 502 Bad Gateway error when opening Windows Security or trying to update Windows Defe...

After a Chrome update, you might see errors like ERR_CONNECTION_RESET, E...

Fix OneDrive Sync Update Error 0x8004de40
You see error 0x8004de40 when OneDrive tries to sync or update. The error usually means a credent...