Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you see a message like “Windows Search service is not running” in the search box or in setti...

You may see an error saying "Windows Defender authentication failed" after applying a Group Polic...

You've waited for a Windows update to finish, but it's stuck at 100% for minutes or hours. This i...

Before you click "Install" on that Windows security update, a few minutes of preparation can save...

After a Windows update, some users find that Windows Defender is missing from the system tray, Se...

You see "Windows activation authentication failed" or "product key not valid" when trying to acti...