Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If Windows Defender won’t open—whether it crashes, shows a blank window, or does nothing when you...

If Windows Defender keeps asking you to sign in repeatedly, even after you've logged in with your...

You installed a new antivirus program, and now Windows Update won't run. The service might be dis...

If you see a '502 bad gateway' error in Windows Defender, it usually means the security service c...

You try to check for Windows updates and see an error like “Authentication failed” or “Password i...

After a Windows update, the search bar may stop responding or show no results. This is a known is...