Halo 2? So you spend (say) $200 on an OS that's going to slow down your computer just so you can play the PC version of a game that's at best mediocre (Halo = poo. Only the XBox people got excited about it, and Halo 2 is just more Halo) and the thick end of 2 years old?
What a deal!
Also, your link is broken.