I just installed Ultimate Vista and my Games are slower.
_________________________________________________________________
Vista will take up a good bit of ram and cpu, you can run your games just fine with some tweaks, your operating systym is not at fualt, your hardware can use an upgrade. I have run any game you can name(yes for real), 1gig of ram and a 128mb video card that is compatable is the minimum, you can make up the lack in settings( I play gothic 3 with a simalar system), you will get none of the features though.