i havent had a problem with win7
steam: rileycola
psn: RileyCola
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I use Win7 and the only compatibility issues that I have run across is that my DS lite's usb wi-fi adapter will not work *shrug* I just connected to my wireless signal and any thing that gave me an issue I have been able to get working by simply giving it admin rights.
I have like 130+ games and everyone of them works fine if not better then it did with XP, though I have upgraded my system.
Vista has a ton of issues I have spent hours helping people get shit working with vista. Win7 > Vista
XP is nice as long as you don't want to be able to play newer games.