I have a new computer but I am using my old Dell 5.1 speakers. I am running Vista Home Premium, I have an Nvidia GeForce 9500 GT graphics card, Realteck High Definition Audio Sound (integrated) and a HP w2207h Monitor. The monitor output is HDMI or VGA. The Nvidia input is only AVI. I have a HDMI-AVI cord so I can run from HDMI on my monitor to AVI on the Nvidia. The Realteck is set to Speakers as default. If I got to set up I can set up for 5.1 surround sound. I can test all speakers (FR,FL,C,S,RR & RL) and they all work fine. If I go to play a song I only get stero (LR&RR) speakers to play. I have tried switching to VGA (have to use a VGA to AVI adapter for Nvidia Card) and the same thing happens. Why will my system test fine for 5.1 but only play stereo. My HP monitor does have its own set of speakers but I have them shut off. Any suggestions would be greatly appreciated.