Upgrading to Vista isn't worth it, Yet! You need a really good computer to run it in the first place and then even if you can run it, it will take over all your system resources and slow down your game playing badly. When in normal running mode XP has around 40 processes running compared to Vista's 60. So yeah, unless you've got some kind of top end computer that can both run Vista and Games at the same time, then it isn't worth it.
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