Knowledge base for software setup, errors, and daily tool work.

How to Fix Windows Update Error 404 Not Found

You see error 404 when checking for updates in Windows Update. This usually means the update serv...

Fix Windows Activation Error 'Permission Denied' in Command Line

When you try to activate Windows using the command line (slmgr.vbs or slui.exe) and see 'Permissi...

Fix Jupyter Notebook Token Not Working on Windows

When you start Jupyter Notebook (or JupyterLab) on Windows, it often opens a browser tab asking f...

Command Prompt Setup Guide for Beginners

What is Command Prompt?

Command Prompt is a text-based interface in Windows that lets you...

Fix Missing Windows Security After Update

After a Windows update, you might find that Windows Security (formerly Windows Defender) is missi...

BitLocker Invalid Configuration: Troubleshooting Checklist

If you see a 'BitLocker invalid configuration' error, it usually means the TPM (Trusted Platform ...