HI I purchaced an nVidia M7NCD motherboard and it is advertised to have Dolby 5.1 audio. i however do not have anything on my computer to change the audio plugs at the back from pink, blue and green to yellow black and green. i know if there is usually anysoftware installed to allow me to do this then it puts an icon in the bottim right of the screen. i only got one drivers cd with it and have completely installed the cd. can anyone help, thanks.