well considering vista is recommended to run on a gig of ram, you will need a pretty beastie computer to run it in VMware. i have a FX-60 with 2gig of ram and 1900xt (PCI-E), and a shit load of hard drives. when i ran Vista in VMware through XP it ran decent but trust me its much better of an experience when its run by itself. but if you just want to see what its like first then by all means VMware works.