I've got a Creative Audigy Platinum (the first they made). The cards fine, but the Creative Drivers for this card for XP are total rubbish and I am using a set of 3rd party drivers ("the KX Project") which work fine.

Hopefully for newer cards the drivers are better.

Creative cards evoke some strong responses; I know that there are forum members out there who have had real problems with Creative stuff and I'm sure some quality alternatives will be suggested!