Because it's compatible with the other PC's at work.. like 90%+ of the world uses it, Laptop came with Vista, I'm a Linux noob, Linux is not so user friendly, my dad wanted XP on the PC, commercial games are not compatible with linux.

I tried MAC, the OS is too plain! Linux.. well, trying to learn some linux stuff.. still a noob though!

I'm not so happy with Windows.. but I gotta use that.