Howdy MG,
This is just a stinker of a problem...
Did you peruse the Creative forum? The Audigy sound card discussion starts at
http://forums.creative.com/creativelabs?region=CLI , and it looked like a couple of the topics might be headed in the same direction, though I didn't look closely.
Also, just a note on the registry bit, I use a software program called Registry Mechanic, and I let it do a registry scan and clean up every time I start my machine. It has kept me going quite well. When I first got it, my machine had slowed noticeably, and I had some "issues" with some software running properly. I ran RM the first time, and had something like 800 (yes, eighthundred) errors that needed repairing. Fixed them, and all the problems disappeared, and my machine picked up speed. I highly recommend it. You can get a trial version which does a good bit, but doesn't do deep registry scans. I think it cost $30 last year when I got it.
ttfn,
Sherry