Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you try to open Windows Security (formerly Windows Defender Security Center) and see a messa...

When you try to open the Windows Update log file (usually %windir%\WindowsUpdate.log...

If you see activation errors like “Windows is not activated” or “We can’t activate Windows on thi...

If you're seeing a "502 Bad Gateway" error when opening Windows Security (also known as Windows D...

You're installing or upgrading Windows 10 and see the error: "BitLocker module not found"...

Windows Security for Ubuntu Installation Checklist
Before You Install Ubuntu
If you're dual-booting Windows and Ubuntu, or replacing Windows...