Surround Sound support? Hardware?

[Major_Tom]

I have 5.1 surround, I can't think of anything that could enhance the game more than that, my problem is that when I go into the sound menu, and turn on 'hardware', it then tells me that I need to restart the game, I'll do that, but when I return to the sound menu, hardware is switched back to 'off'. I've looked around everywhere, even this help forum and can't find a solution.

I'm running Visa 64 bit, and I don't know what kind of integrated hd sound my computer has, but the surround works well with other games. Is it that my hardware can't support this? Any help would be greatly appreciated.