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

How to Fix Windows Activation Error 0xc004c003 After Motherboard Swap

After replacing your motherboard, Windows may show activation error 0xc004c003. This means the ac...

BitLocker Backup Restore Tool Not Detecting Drive: Fixes

You connect a drive that contains a BitLocker backup, but the restore tool doesn't see it. This c...

Fix Putty Connection Refused on Port 22

You try to connect to a remote server with Putty on port 22, but you get 'Connection refused'. Th...

Microsoft Teams Screen Sharing Not Working on Mac: Fixes

You're in a meeting, click the share button, and nothing happens—or your screen shows a black box...

Fix Windows 11 Update Stuck on Downloading

You click 'Check for updates' and see the progress bar stuck at 0% or a percentage that doesn't m...

Fix Windows Defender Proxy Error: Permission Denied