Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see "We can't activate Windows on this device because of a proxy error" or similar, your s...

You try to open a website in Firefox and see a full-page error: "Secure Connection Failed" with a...

If you're seeing a "504 Gateway Timeout" error when using Windows Search—especially when searchin...

You're running a Python script and get an error like ModuleNotFoundError: No module named '...

Python Module Not Found Despite pip list Showing It
You run pip list and see the module is installed, but when you try to import it in P...

Fix Windows Search Update Stuck on Installing
You see a Windows Search update stuck on 'Installing' in Windows Update. The progress bar doesn't...