I am a gamer spending about 4~5 hours playing stuff like OBLIVION which is veryyyyyy resource demanding. so how can i optimize my pc for gaming. i am only interested in gaming along with a little bit of internet surfing. My rig is a modest one with :- pentium 4 516 2.93 GhZ. 1 gb ddr ram 128 mb nvidia 6600gt. other things qare normal.