Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

After upgrading Windows—whether from Home to Pro or from an older build to a newer one—you might ...

If the Microsoft Store won't open, apps fail to download, or you see error codes like 0x80072efd ...

If you need to run Windows Defender scans or update definitions from the command line, you'll use...

You try to activate Windows, but you see an error saying it can't connect to the activation serve...

If you see a message in Windows Security that says something like "Security module not found" or ...

You've enabled OneDrive Files On-Demand, but files that should be available offline remain as pla...