I still do not understand the decision for Halo 2 to be on Vista. I would think XP would be a much better choice. With a likely delay for Vista, not to mention, the not so great reviews of the beta it is hard to believe that a lot of people will even have Vista by the time H2 for Vista comes out. On top of that, many PCs don't even have the specs to run Vista. Paying hundreds of dollars for a new OS, that isn't great doesn't sound good to me. Bungie should have made Halo 2 for XP, and I feel making it for Vista will be a big mistake.