Hi Codfish,

your very welcome and hopefully we'll eventually get to the bottom of this 'mystery'! A Creative sound card you say... Hmm well they're well known for their awful drivers, have you seen my other post regarding Creative drivers?
If not here's the link:
http://winvistaforums.com/windows-vi...ers-vista.html
You'll see a link to some modded drivers and what this guy has done is turn those awful bits of software into useful drivers again. This is something I can testify to as I own a S/B Audigy (see sig) and after installing his set of drivers the worked just like it did in XP.
I'm not saying this is the answer but at least it'll be another 'grey' area ticked off.

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