Checklists for software errors, setup, and tool workflows.

Jupyter Kernel Not Starting Python Environment: Fixes

You launch a Jupyter notebook, select your Python environment kernel, and the notebook stays stuc...

Command Prompt Not Working After Windows Update: Fixes

After a Windows update, Command Prompt may fail to open, show a blank window, or close immediatel...

Fix Windows Defender Access Denied Error on Startup

If you see 'Windows Defender failed to start access denied' when you open Windows Security or aft...

How to Resolve Outlook Invalid Configuration on Windows 10

You try to open Outlook and see an error that the configuration is invalid. This usually happens ...

Fix CMD Service Unavailable Due to Group Policy

Situation

You open Command Prompt and see an error like "Command Prompt has been disabled...

Where Windows Defender Stores Its Cache Files

If Windows Defender (now Microsoft Defender Antivirus) won't update definitions, hangs during sca...