Halo 2 Vista - Windows 7 Audio Problem

PLEASE HELP!!! Whenever I load Halo 2 Vista, the initial logos like “Halo, Bungie Microsoft” etc. have audio, I suspect it is because they are just video files. The loading screen does the same thing. But when in game or at the menu, there is no sound! I’ve tried every single option in the game! I have played through Halo 2 Vista before on this same computer! But recently I had to re-install Windows 7, and my main drive is now an SSD. This problem is very annoying, if anyone knows how to fix it, please respond! I use on board audio going out through my graphics card’s HDMI port. It is a 5.1 speaker system, and I have no audio problems outside of this. The game runs “fine” otherwise (as well as H2 Vista ever runs).

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