I never liked Windows very much, being brought up on a mac, but I have to say that Win7 is so far the best os I have tried. I had the Release Candidate for a year, and it managed to play some very old games that Vista routinely rejected (like MythII: Soulblighter). AIWar works very well on Win7, I got the game around Christmas and have played it almost daily ever since, and it has crashed on me only two times. I know of no other software/os combination that is so stable (with the possible exception of Dawn of Discovery, which has only crashed on me once).