I have an Asus K8V and have been working Vista x64 also. I don't use the S/PDIF so the AC97 driver is working fine for me, sorry I can't help. Have you been able to get networking going with yours, either with the Yukon or with a NIC? I've been working with MS now for a week trying to get mine online and I'm about to give up....they obviously don't really know yet but are trying.