No sound on HDMI with Windows 7 om Mac Mini 2010

Hi,
i've installed bootcamp (windows 7 64 bit) on a new mac mini. When I turn on power an boot windows there's no sound over HDMI. The windows device manager says that everything is working properly.
Then I boot mac os and HDMI sound works fine in mac os. Then booting windows again HDMI sound is working in windows too. But when I turn of the mac and turn it on again booting windows sound is missing again.
Any suggestions? I updated to the latest nvidia hdmi audio driver without success.

Found a workaround: The problem is not the NVidia HDMI audio driver but the Microsoft HD audio driver / device. If you have no sound over HDMI with your Mac Mini you have to
1) Find out the hardware ID of the Microsoft HD Audio Device:
* windows device manager -> system devices -> High definition audio controller
* right mouseclick -> device properties -> Details -> select HardwareID
2) Use the devcon command line utility to disable and enable the device:
devcon disable "HardwareID"
devcon enable "HardwareID"
And you will have HDMI sound again.

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