I'd be very wary of E-mu products now.
There have been no new drivers for any of their products for more than two years. Technical queries on the Creative/E-mu forums always seem to be answered by the same single guy who keeps repeating the company line that they are "consolidating" but there's never any real help. The Beta driver mentioned by the OP has been posted for more than two years now with no signs of it being replaced by the real thing.
If E-mu isn't dead it's certainly on life support waiting for Creative to pull the plug.
I'm afraid I wouldn't risk their gear now--which is unfortunate since they made some good stuff. If you really need an OS upgrade, I guess it's worth trying the Beta driver but there are lots of complaints on the E-mu forum. In your situation I dunno what I'd do other than mutter some nasty words about Creative screwing up their only good stuff.
The pessimist sees the glass as half empty. The optimist sees it as half full. The realist just drains the darn thing and gets a refill!