Hello, I know a lot of people have been upset about Halo 2 only being for the new Windows Vista operationg system (including myself, becauce I need to buy $200 in hardware just to run Vista), but why does it have to be only for Vista? According to Microsoft, Halo 2 is only for Windows Vista because Windows Live is not aviable in Windows XP. However, I am in the Windows Live beta, and have successfully installed Windows Live in Windows XP. So Windows Live IS aviable in XP. I had to set up my laptop in a dual-boot configuration with Windows XP and Ubuntu Linux, leaving Windows on there for gaming. So if Live is aviable in XP, why is Halo 2 only for Vista?