Of course w a system change there's another set or drivers etc. and it appears NVIDIA as part of my MSI graphics card has incorporated their HD audio in with the graphics card. I have this SW installed in my copy of Win 8 (64 bit).
Now the burning question of the day is, has anyone had a bad sound experience with their Diablo III installation with any Win 7 or greater 64 bit operating systems? The symptoms I've experienced is sound fading, dropping altogether, and returning in ear drum reversing fashion sometimes coupled with scratchy periods as if BBs are hitting a window.