lol, you might wanna wait from a answer from the other guys, but the first thing i would try is to make damn sure you install your sound cards first after you format and install winxp, it will assign the irq's right then and there, and ive cleared up sound problems like that before due irq shareing, but if its one of the ports he disabled that is taking up that irq, then there will still be a conflict when you install your sound card and you will need to disable them.....(i think [lol])..... with most modern boards there usually is plenty of irq's, its when you fill up your pci slots that shit starts messing up, so like i said, just try unplugging each of your pci devices, and keep your sound cards in, once they are installed try installing your other devices, if there is still conflicts you will need to disable some of the unused ones to keep them open for other pci devices.
note : do not go off just what i say, im a stoned ass musician that can build a computer and make it work, i am in no way a computer tekkie, so leave it to the true tekki's to keep you on the right track, this is just a suggestion hahaha -- peace