Hi Wierd problem this morning. With my Windows 7 64-bit. I notice dual channel audio isn't working. This system is using motherboard audio (http://www.asus.com/Motherboards/P5SMX_SE/). Which only has a single dual channel. So it should ONLY be able to support 2.0 channel audio. I go Sound > Right click speaker > Choose your Configuration Then at "Speaker Setup" under "Audio channels" i ONLY see "5.1 Surround", no other channels are available. This doesn't make any sense, this system has no ability to do 5.1 audio! Only 2.0! I want to be able to see/select 2.0 channel. Help.