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

Jupyter Kernel Dead: Common Causes and Fixes

You're working in a Jupyter notebook, and suddenly the kernel dies. The notebook becomes unrespon...

BitLocker Recovery Key Not Accepted: Fix Authentication Failed Error

Fix SSH Permission Denied (publickey) Error

You try to SSH into a server and get Permission denied (publickey). This typically m...

PowerShell Not Responding When Opening: Quick Fixes

You click PowerShell and nothing happens — or the window opens but immediately freezes. This is a...

Fix Windows Defender Module Not Found Error

You open Windows Security and see an error: "Module not found" or "Windows Defender module not fo...

Fix Windows Defender Permission Denied Error

You open Windows Security, try to run a scan, or enable real-time protection, and get a message l...