Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When OneDrive shows "sync service unavailable," files stop syncing and you may see error codes li...

If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

You're trying to download or update an app from the Microsoft Store, and you get a message about ...

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

Windows Update errors often appear with little context — a generic code like 0x80070002 or 0x8024...

You're updating Windows 11, and the screen shows a spinning circle or a progress bar that hasn't ...