The first great game for the PC was Wizardry. I have one puter set up with DOS 6.22 to run both it and the next greatest game, which was Doom. I have another puter set up with Win98SE that plays the next greatest game....Diablo 1. That puter also plays Diablo 2 and Bards Tale. Bards Tale was similar to a updated Wizardry and uses the Wizardry engine apparently. If you are careful and watch out for legacy computers, you can get them sometimes for free but always for less then 20 bucks.
I also use Win 7 for everyday (boring) computer chores and INet. And I loathe Win 8 which came on my laptop that I only use when absolutely necessary on trips.