Beepster
Quite a few people have been having success running X2 on Vista but support won't be able to help you (or at least not as much). I also read that the big problem with Vista is gonna come when they patch X2 to deal with Win8 and it's touchscreen capabilities and I don't think even the Bakers know what's gonna happen at that point because Win 8 is still a completely new animal. I love Win 7 BTW. It's worth the upgrade to 7. I think 8 is gonna flop. Cheers.
It's been stated by Cakewalk that X2 will not run on anything prior to Windows 7 after you install the first official patch.
So it's time to upgrade to at least Windows 7 gfeel. Or, wait and see if that's true. Sometimes they say one thing, but another ends up happening.
I was always under the impression that Vista and Windows 7 were identical after you installed a ton of patches in Vista ... but I must be wrong.