Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You type a query into the Start menu or File Explorer search box, but no results appear—or only p...

You try to visit a secure site in Chrome and get an error like ERR_SSL_PROTOCOL_ERROR or...

You start downloading an app from the Windows Store, but the progress bar stays at 0% or a small ...

If you see a message that Windows Defender is not running or the security center shows it's off, ...

You try to activate Windows and see an error like “We can’t activate Windows on this device becau...

You try to open a shared mailbox in Outlook and see a 404 Not Found error. This usually means Out...