Nothing, that's what most enthusiasts use
When vista was first out that was true, but it has long since matured. I've hooked up 3 different cameras to mine, they all worked fine, and have never had driver trouble, save the x64 wireless drivers which weren't available for winxp x64 either
See above - get the compatibility updates. If that doesn't work patch the game, alot of devs released patches to fix those problems (if they existed, only game I've had issues with is WiC, only under the 32-bit version oddly
).
Vista wasn't meant for older PCs. It performs just as well, if not better, than XP on my rig.
There's a reason that enthusiasts are recommending Vista for
new builds