There are drivers provided with WinXP for this sound card - I am using them with no problems. I'm not sure what kind of 3D audio support it provides, but I know for sure that the digital output works with these drivers. However, if you get the updated drivers from Windows Update, digital audio out will NOT work (this can be verified with some other people on the forums at vortexofsound.com, in addition to myself).
I currently have the digital out hooked up to my MiniDisc recorder, and for some reason my PC is not inserting track marks between CD tracks or between different MP3 files played through Winamp. I have my CD/DVD drives set up to play the audio digitally, so I assumed that it would work. Does anyone know if this is a problem with the sound card/drivers, or do I have to do something special to my PC to make it insert track marks in the right spots?