No active audio mixer

Hi, I have some problem with my comp, I couldn't get the sound to work no matter what, it give me this error http://img103.exs.cx/img103/1109/NewBitmapImage3.jpg My motherboard has it's own onboard audio, I added a Creative Lab CT4750 audio card, I couldn't get either of them to work. I lost the software for my CT4750, and I couldn't find a driver for it anywhere, not even on Creative Lab's site, if anyone has the software, please send it to me, my email is [email protected] , if anyone have any idea how to make it work please reply, thanks.