Well, if you are looking for action, try Warcraft 3 "DoTA" map mod.

I know its from a RPG game, but its more action pack based. But too bad its just 5 person per team max with 2 team against each other. Tight teamwork needed in the game. You can get more information and the map from www.getdota.com and www.dota-allstars.com

 (its ok to post other website address rite? :?  )

oh, dont worry about the dual boot thing. I got the dual boot setup at home. (3 boot actually if u count my PCLinuxOS)
So far it works fine. I dual/triple boot it with Windows XP Pro, PCLinuxOS, Vista Home Premium, but all from different partition of course...

U might want to check out nVidia latest driver as I heard that they have a bit of a problem for 8800 series gcard in Vista.
Oh, bythe way, if you want to play games on Vista, i recommend you take at least 2GB of ram. I use vista. At idle, they take up about 524MB of ram, at IDLE. So when you load up the antivirus, antispyware, widgets, etc.. it wont left much for your games... just a thought.

Take into consideration the version of vista you are using too. Get the 64-bit version if your cpu support it. Of course its a no brainer that getting Vista Ultimate edition is every gamers dream. Mine is only the Home Premium at home and Business at office.