For what it's worth, the Dell driver in XP compatibility mode worked for me. I must have a slightly different card than you or something, since windows update had nothing on it for me.
Thanks for your help nonetheless,
I just recently put Vista on a Dell Dimension 8250. I have Vista recognised everything except the soundboard. It's a Dell OEM Sound Blaster Live! 5.1 Digital. Dell doesn't have any drivers, neither does Creative.
I have tried the ngo drivers, and the Realtek drivers (I was out of ideas)...