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

Fix Windows Activation Error 0xc004c003 After Hardware Change

If you see error 0xc004c003 after upgrading your PC's motherboard, CPU, or other major hardware, ...

Fix Windows Terminal Profile Not Saving Ubuntu Settings

You set up a custom profile for Ubuntu in Windows Terminal, change the icon, font, or starting di...

Fix VirtualBox Kernel Driver Permission Denied on Linux

How to Fix Windows Defender Cannot Connect Issue

If you see “Windows Defender cannot connect” or similar errors, it usually means the service is b...

Fix Windows Search 502 Bad Gateway After Update

After a recent Windows Update, you might see a “502 Bad Gateway” error when using Windows Search....

How to Fix Windows Activation Error 0x8007007b

When you see error 0x8007007b during Windows activation, it usually means the operating system ca...