HELP!!!! Sony dr-bt21g problem

HI guys,

I just bought a Sony dr-bt21g stereo bluetooth heaset to pair with my jabra a320s stereo bluetooth dongle.

The headset is working fine when i connect it to my mobile. But when i connect it to my PC i cant hear anything.

The Devices ( laptop and headset) are shown as connected in the laptop. Also i can control Windows media player from the headset. but cant hear any audio in the headset.

Spent one whole night on it and still no solution.

Please guys

help me out here

thanks