Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to turn on Windows Defender, but get an "Access Denied" message. This usually means somet...

If you see a '404 Not Found' error when opening Windows Security (formerly Windows Defender), the...

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

You try to run Windows Update in Windows 10 but get a 'permission denied' error. This often happe...

If you notice PowerShell using 30-100% CPU for extended periods, it's often caused by misconfigur...

When Windows Update downloads crawl, it's usually not your internet connection. Here are practica...