again i say, i've got X-Fi cards to run on vista from the drivers supplied off creative's site. i dont see where you would be running into issues. i work tech support ( ) at Gateway and we use the X-Fi in our high-end systems, and there have been plenty of calls with your issue that I've been able to resolve by that driver install off creative's site.
what is the issue you are running into??? does the driver seem to install successfully, but regardless, no sound? error msg? after the install, what does device manager show for a sound device?