I have Win 7 Ultimate 64 bit, and 2.1 speakers. My mobo is Gigabyte GA EX58 UD5 with Realtek HD audio. It only seems to support Stereo, Quadrophonic, 1.5 and 1.7 sounds. Stereo for some reason won't work, and so i can't use anything else but headphones which make my head ache. I need to be able...