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

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...

How to Clear SSH Known Hosts and Fix Host Key Verification Failed

Fix Remote Desktop Black Screen After Login on Windows

You log into a remote Windows machine via RDP, see the login screen, enter your credentials, and ...

Fix Outlook PST File Access Permission Error

When you see "Outlook PST file cannot be accessed. Permission denied" or a similar error, Outlook...

How to Fix Microsoft Store Not Opening on Mac

If you're trying to open the Microsoft Store on your Mac and nothing happens—or you see a blank p...

Windows Defender Real-Time Protection Won’t Turn Off: Fixes

You go into Windows Security, toggle off real-time protection, and within a few minutes it’s back...