Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you try to activate Windows using the Settings app or a command, slui.exe (Software Licensin...

When you start Firefox and see an error like “Your Firefox profile cannot be loaded. It may b...

Fix Command Prompt Update Not Working
If you've tried to update Windows or a specific program via Command Prompt and the update won't r...

How to Fix Windows Security File Locked Errors
You try to open a file and see a message like "The file is locked" or "Access denied." Sometimes ...

Fix Command Prompt Not Launching from Taskbar
You click the Command Prompt icon on the taskbar, but nothing happens. No window, no error, just ...

Fix Windows Security 404 Error & Missing Files
If you see a 404 error in Windows Security or get messages about missing files, the Security Cent...