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[Scatty]

Can't help you with the registry key, but there's another way for it, too. Go to Start - System Control - System. There go to Hardware-Tab, click on Device Manager. Find your card in the list, right-click on it and select "Search for changed Hardware".
Or if you mean you don't have the soundcard in the list yet, well, then Windows should start to detect it automatically upon after it starts.