OK since we didn't get back on topic...
Terry, - IMO, you are neither polite, nor helpful. - If that is what you are attempting, then you are not succeeding.
You're entitled to your opinion, of course. What would constitute being polite and helpful?
If you have established that installing Windows Media Centre corrects your lack-of-sound problem, then a logical step would be to determine what has been added/changed to/with your system/s by adding the WMC that then allows the MA3 .sgt files to be heard.
I've often wondered how to do that (install something on a Windows computer and then determine exactly and completely what has been changed). How do you do it?
That's a serious question and not intended to be impolite. I'm asking for practical help. Thanks.