I only get sound from the front left and right speakers. I have 64 bit Windows 7 and Realtek HD audio with updated drivers. I run the hdmi through the video card(AMD Radeon HD 6800 Series) to my receiver. When I go into the configuration for Realtek and test the speakers individually, they all work. My Receiver always says decoder off. What can I do to get surround coming from my pc? It seems like a lot of people have problems with this and answers likewise seem difficult to come by. Thank you.