Sony HBH-65 with Bluetooth laptop

Hi,

Hope someone can help. I have a Sony HBH-65 and an HP nx9110 laptop
with bluetooth (widcomm) using the 3.0.1.905 drivers on Windows XP SP1
(it's a corporate laptop so no SP2 for me).

I can get the laptop and headset to pair ok and to work as an audio
gateway but.... the headset rings (ok, psuedo electronic ring sound!)
twice every 10 seconds non-stop while paired. I am unable to received
anything from the headset mic or send anything to the headset earpiece
at all.

I've tried secure connection and un-secure connection to no avail.

Am I going mad? I can't seem to find anyone else who has had the same
issue!

Thanks in advance for any ideas!

JB.