HT3986 Why does the sound output not work on Windows 7 Bootcamp?

The internal speakers work fine, but I want to use my surround sound and can't seem to get it to work. It doesn't even work with headphones. Is there an update I need to install or what?

Alll I can offer is what I bookmarked, that you can access, other threads, and of course Google and what others have found works.
A simple instruction manual I can't offer but a few words of wisdom, Apple provides driver to enable a chip or device but that is not the end, just the beginning.
"Cirrus+audio+iMac+Windows"

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