AG2712 Win8.1 Upgrade: High Def Audio Disabled

I'm rebuilding my AIO (after brand new restore disks failed!) to Windows 8.1 and have one remaining problem: High Def Audio Controller (VEN_1002&DEVAAB0) is disabled.   Is this a driver issue?
Thanks,
Douglas

When in Device Manager, I right-click enable the disabled High Definition Audio Controller, I get an error on the ATI HDMI Audio device in Sound, video and game controllers.
I'm using driver 6.0.1.6650, which is probably the problem, as it is dated 6/4/2012. I've been unsuccessful attempting to update.

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