Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're setting up Command Prompt on a machine with no internet connection, a few configuration...

You try to run slmgr /ato or slmgr /ipk in Command Prompt, but Windows ...

If you see a '502 bad gateway' error in Windows Defender, it usually means the security service c...

When you try to update or run Windows Defender, you might see error 0x80070643 with a message lik...

If the Windows Security app is crashing, not opening, or showing errors, resetting it can often f...

If Chrome stops responding on macOS Ventura—clicking does nothing, the window goes gray, or you s...