Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You type a command you know is installed, but the shell replies: command not found. ...

You installed Node.js but when you try to run npm in your terminal, you get np...

Fix Command Prompt Service Unavailable After Update
After a Windows update, you might see the error "Command Prompt service unavailable"

Fix Windows Update Cannot Connect After Reset
After performing a Windows reset, you may find that Windows Update cannot connect to the servers....

How to Stop and Restart Windows Update Service
If Windows Update is stuck downloading updates, keeps failing with error codes, or won't start at...

Fix Windows Defender Login Loop in Safe Mode
If Windows Defender keeps asking you to sign in repeatedly—even in Safe Mode—the problem is usual...