I have the similar difficulty as Future.

I have an original sound card and 5.1 Logitech which worked luminously in windows xp but since I improved to windows 7 my sounds playback is actually dodgy. The sound first of all sounds choppy particularly when I'm doing something in the background and I acquired 4 gig ram so I don't believe that is the problem. I've tried every imaginable thing to try and modify the sound settings so it supports all 5 speakers but only the 2 front ones play. When I run a test all the speakers work but through playback only two work.

What do I do.... revert back to xp but loose the luminous new features of windows 7?