Vista - Bluetooth devices added and found but never connected

Hello,

i just installed a new bluetooth dongle (dlink DBT 122) and i got it
installed and recognized. I added a headset (logitech) and it found it,
added it to the list of bluetooth peripherals installed the "headset"
service of the device, but it never keep being connected or authenticated.
So i can't find it in the devices list in skype or Teamspeak.
each time i push the button on my device, it writes "connected" under it in
the list of bluetooth devices but the "connected" word diseappears one
second later...

what did i do wrong?

thanks in advance.