Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

View list

How to Fix Windows Security Real-Time Protection Not Turning On

If you see that Windows Security's real-time protection is stuck off and won't turn on, you're no...

How to Stop Command Prompt from Freezing on Startup

If Command Prompt (cmd.exe) freezes or hangs shortly after opening, it's usually due to a startup...

Fix Windows Defender SSL Certificate Error Not Working

You might see an error like 'Windows Defender cannot check for definitions because of an SSL cert...

Fix Task Scheduler 502 Bad Gateway After Windows Update

After a Windows update, you might see a 502 Bad Gateway error when using Task Scheduler. This usu...

Fix 'Permission Denied' When Creating a Folder in Command Prompt

You type mkdir newfolder in Command Prompt and get "Access is denied"

Fix Windows Activation Proxy Error After Network Change
After changing networks—moving offices, switching ISPs, or reconfiguring a VPN—you might see a Wi...