Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

After changing your account password, Outlook may suddenly throw an “access denied” error when tr...

If the Microsoft Store won't open, shows blank pages, or gives download errors, the built-in

You downloaded the offline installer for Microsoft Office or Outlook, but during setup you see a ...

You may see a notification that Windows Search indexing couldn't start due to an authentication f...

If Windows Search stops returning files, emails, or settings, the search index database may be co...

When you click the Windows Defender Security Center icon or try to open it from Settings, nothing...