Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you set up a new PC, Windows Defender (now called Microsoft Defender Antivirus) is already a...

You click Install in the Microsoft Store, and after a long wait you see “Installation failed” wit...

Windows Defender (now Microsoft Defender Antivirus) can sometimes show configuration errors—setti...

If you see "Chrome profile error occurred permission denied" when launching Chrome, your browser ...

You might see an error like 'Windows Defender dependency conflict' or find that Defender won't st...

If you see "Windows Defender service not running" or a red warning in Security Center, the underl...