Seriously if so called "gamers" are still back in the stone age (XP) they need to get with it and upgrade! It doesn't cost much (they were practically giving away 7 Pro upgrades to students) to upgrade to Windows 7! There have been student discounts, preorder discounts, and there are family packs. Hell, you can get a full OEM windows 7 pros for $125!
XP was good for its time but it is now time to move on!
The game looks pretty cool. I'll definitely hit up the demo when it comes out.