I have a ASUS M4A785TD-M EVO AM3 AMD 785G. The problem is no sound using hdmi out on windows 7 pro 64bit. I dual boot winxp and win7 and in winxp i get sound using hdmi. Only thing that changes is the os. I have the updated drives from via and hdmi audio is enabled and it's not muted. Can anyone help me get sound out of hdmi on win7 64?