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

Fix Command Prompt Not Working After Windows Update

After a Windows update, you might click Command Prompt and nothing happens—or it opens and closes...

Command Prompt Setup Guide for Beginners

What is Command Prompt?

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

Fix Windows Defender Service Not Starting with Permission Denied

If you see 'Windows Defender service not starting – permission denied' when trying to enable Micr...

Fix Outlook File Locked Error: Practical Steps

You try to open Outlook and see a message like "The file Outlook.pst is locked" or "Cannot open y...

Fix Windows Update Authentication Failed Error

When Windows Update fails with an authentication failed error, it usually points to a problem wit...

Fix Windows Defender Service Not Starting (Error 404)

If you see error 404 when trying to start Windows Defender, it usually means the service executab...