Actually when Vista first came out Creative's support site was seeing Vista drivers download and install on XP causing problems with the automatic updater that runs when first installing everything. Later they cleaned up that mess and separated each update.
The one thiing you didn't look at with that brand of card is what versions are supported. newguy11 is running Vista while the drivers for that list only upto XP! Creative drivers not only work well on 7 so far they carry updates for the 64bit editions of Vista.