Something else along these lines that's come up for me a couple of times is the requirement to use any ATI card's driver disk first rather than going for the latest drivers from ATI's website.
Maybe it's just me, but the drivers for the HD sound on ATI cards doesn't seem to install along with the Catylist (sp?) drivers leaving the dreaded "unknown device" warning in device manager. (It's been a month or so since I checked, but I also couldn't find a stand-alone driver on the ATI site for HD Audio from their cards).
Once the shipped drivers are installed, the latest drivers are fine
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