Using TDK dongle... Vaio and Nokia recognise each other and I can use the shared folder to send .sis files etc (one way)... but the phone is not 'connected' in terms of (a) the Bluetooth Serial Port or (b) the PC Suite - the latter just says 'disconnected - attach phone and click OK' even when phone and laptop USB dongle are both on. How do I make them connect ??

I'd advice you to first visit the following address: http://www.no2wires.com/

There should be some instructions for TDK Bluetooth products and the Nokia 7650.

Tero