I don't know why you'd want Halo 2 anyway! I played Halo on the PC, and frankly it was just the worse side of rubbish. After all the hype I'd been hearing from X-box gamers, I was really disappointed. The same level, with the same enemies, in the same config, over and over again. Boring. The only good thing about the game was the Warthog, and being able to tail-whip it on the PC.
About the only thing from the X-box that's going to make it onto my PC is the Steel Battalion controller.

And of course it's going to be Vista only. I'd bet reasonable amounts of money that every Microsoft game is going to be Vista only from now on. They'd all work fine on XP, I'm betting, but Bill doesn't want you to stay on a system that doesn't make him more mone-...I mean, an inferior system. He's only thinking in your best interests, remember!
Love the corporation. Conform. Consume. Obey.
Did I just post that on an MS forum? I'm gonna get pwned now.