My Soundcard is Soundblaster Live 5.1
Now, this is an old card. From 1997 or so I believe. I doubt you will find any as old sound card supported by Vista. Audigy and X-Fi are supported, I doubt Live is.
An option for you: considering Audigy and Live use the same chip and some people used Audigy driver with Live, perhaps this will work under Vista, too. Can't see why it shouldn't...
You could download Audigy vista beta driver, extract it with winrar into a folder and install it manually from device manager with F8 driver signature off (and fully cleaned registry beforehand