Checklists for software errors, setup, and tool workflows.

Fix Windows Defender Update Error 0x80070005

You see error 0x80070005 when trying to update Windows Defender. This usually means a permission ...

Windows Defender Service Not Starting: Fixes and Checks

When Windows Defender won't start, you might see an error like "Windows Defender service can't be...

Fix Windows Security Token Expired Access Denied Errors

When a Windows security token expires, you may see an 'access denied' error even though you belie...

Cloudflare 522 Error: How to Fix Firewall-Caused Connection Timeouts

If you see a Cloudflare 522 error, it means Cloudflare connected to your origin server but the se...

Windows Security for Ubuntu Installation Checklist

Before You Install Ubuntu

If you're dual-booting Windows and Ubuntu, or replacing Windows...

Fix Windows Activation Failed After Update

After a Windows update, you might see an activation error like "Windows failed to start" or "Acti...