Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

Windows Defender (now called Microsoft Defender Antivirus) sometimes refuses to turn on or stay o...

You open the Microsoft Store and instead of apps, you see a 504 error. This usually means the sto...

If you see “Windows Defender failed to start” with error code 0x800106ba, the Windows Defender se...

You're setting up BitLocker and get a 'connection refused' error. This usually happens during net...

If you see a message like Certbot renewal failed with acme error when running ...

Windows Activation Troubleshooting Checklist
Windows activation can fail for many reasons—product key typos, hardware changes, or server hiccu...