First off, I had R6:Vegas on XP and it worked fine. I upgraded to Vista to get the full potential of the computer (8800GTX <3 DX10) and now the sound won't work correctly.
I'm pretty sure what's wrong is that the sound is set to multi-channel (surround sound) but I'm using headphones. I test the sound with the sound configurator in control panel and the sound icon on the taskbar. If that's the problem, I need to know how to change it to the 2 channel (or whatever will work with headphones) sound.