Well, well, well. I am happy this came up because lookie what I found staring at me when I booted Windows Vista x64 Ultimate with an ASUS M3N78 Pro motherboard I got for review:
Try THAT little head scratcher on for size. Considering this is a 64-bit and I have NOT had this problem with past ASUS nor DFI boards, this one really has be stumped...
Installing SP1 now and then the new BIOS.