How turn off built legacy audio from asus P4T533_C?

[madara]

Hi, doing great with my pc, only problem I have is that when play everquest sounds are just choppy stalling mess. I notice I have legacy audio listed under sound devices with my soundblaster live value. I using SB live value I imagine problem is onboard sound from motherboard seemed to be called legacy. How do I disable those or resolve this problem? Windows XP pro is totally new to me, I did not see disable with right click on item, so at loss, thanks much.
I tried with lastest SB drivers and without, same problem
madara

 

[Den]

I would try diabeling it in BIOS. If you have trouble figuring out how to do this (I think it is under chipset features) private message me and I will check the setting on my machine at home. Once it is "gone" in hardware, XP should be fine.