Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

After a recent Windows Update, you might see a “502 Bad Gateway” error when using Windows Search....

When Windows Search stops returning results or the indexer crashes repeatedly, a dependency confl...

You're trying to run Windows Update and you get a 502 Bad Gateway error. The update check fails, ...

You try to open your Outlook data file (PST) and get an error that the file is locked, or Outlook...

If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...

You're testing a new web app or extension, and it fails to load or behaves oddly. Often the culpr...