Mini DisplayPort no audio Windows 7 x64 (Bootcamp)

Hi all,

I am using my Mac mini to transport movies to my TV. My main display is connected via HDMI and the TV via Mini DisplayPort.

On Mac OS I get HD video and audio over the MiniDisplay port without any problems but on Windows 7 (Bootcamp) there seems to be no audio device in the system settings which could be setup as default audio device. Finally I have video but no audio at all.

Can anybody help me that it works as perfect as in Mac OS?

Thanks,

Uwe