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 real-time protection but get an 'access denied' message. This...

You might see an error like "Windows Defender can't start because of a dependency conflict" or a ...

You're trying to upload a file, allow a website to use your camera, or access a local resource in...

You open Windows Security and see that real-time protection is off, even though you didn't change...

You see a message like "Windows could not search for new updates" or "An error occurred while che...

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