Sennheiser PX 360 BT and windows 7 64 bit

[neoen]

Hi Head-fi,
 
I purchased a pair of Sennheiser PX 360 BT headphones last year and they work great with my Macbook pro but I have never been able to get them working with my Windows 7 (64bit) desktop machine. The headphones are detected by windows as a  bluetooth device but not selectable as a sound output in the control panel. I've tried 2 different bluetooth dongles and windows does the same thing so I'm pretty sure it's not the dongle. Has anyone else managed to get these bluetooth headphones working with Win 7 64bit? 

 

[neoen]

Does anyone know where to purchase a sennheiser bluetooth dongle I can use with my windows 7 64 bit machine? amazon only seems to sell the dongles that plug into iphones...
 
Anyone tried these headphones with any of the sennheiser bluetooth dongles?

 

[neoen]

bumpity