Windows 7: Bluetooth headphones won't work with iTunes

I have a pair of these headphones:
Amazon.com: Sony DRBT21G/B Stereo Bluetooth Headset: Electronics

And so far, they work with absolutely everything except for iTunes.



-The A2DP controls work and change/pause/play songs, but no sound.
-They play audio from every other function on my computer when connected.
-They are set as the default audio output device when connected.
-I am using the stereo function. For the record, using it as a headset won't play sound form iTunes either.
-When paired with my MacBook, they play sound from iTunes, so I know its a problem with Windows iTunes.

I'm not sure what the problem is. I can have sound coming though the headphones, and have iTunes play through my computer speakers at the same time. I've scoured the iTunes preferences and haven't been able to find anything. What am I missing?