Damn this is not going to be a fun one to deal with. Will have to do some work on this one. Try:
1. Uninstall the AGP, sound, and chipset driver. Use driver cleaner to get rid of any lingering files. Then resinstall with latest chipst drivers, sound drivers, agp drivers.
2. Make sure that your AGP card is NOT sharing the same IRQ as the sound card. Could just move the sound card to another PCI to resolve this or move the card and dump the OS. Should have to do this with these mobos today but I would be surprise if there are still a few that will give you issues.
3. Complete Dump of your system.
Try those out first.
<i><font color=red>Only an overclocker can make a computer into a convectional oven.</i></font color=red>