Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If Windows Defender crashes on startup with error code 0x80073b01, the antivirus service may be f...

You see OneDrive error 0x8007016a and your files stop syncing. Usually this means OneDrive can't ...

If Outlook stops connecting to your Yahoo Mail account, you're not alone. This usually happens af...

If you see error 0x80070002 when trying to activate Windows or install updates, it usually means ...

After a Windows update, you might open Outlook and see a “permission denied” error when trying to...

You launch Windows Defender Security Center or try to run a scan, and you see a proxy error—somet...