By any chance is this High Definition Audio? If so, the drivers won't install correctly until you install the High Definition update from Microsoft.
Open up Device Manager (by going to Start...Run...and type in "devmgmt.msc" (without the quotes) and press Enter), then right click on the audio device and select Properties.
Then select the Details tab, and look for Hardware ID in the dropdown box.
Locate the 4 characters after the VEN_ and the 4 characters after the DEV_
Then go to http://www.pcidatabase.com
and enter the characters after the VEN_ in the Vendor search box.
Once you get the vendor page open, search that page for the DEV_ characters. If it says High Definition there, then you'll need the High Definition Update.
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