I got a trojan not too long ago and now almost none of my programs work. ive looked everywhere for my original OS cd so i could just re-install everything and my computer would go back to normal but i havent been able to find it so i was thinking that i would probably just buy another OS. I was wondering, i play alot of games and im on the internet alot, what OS would be the best chioce to buy and easiest to use?