Sony VAIO VGN-SZ600 - Manual (Page 180)

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Troubleshooting
Why can't I connect to a Bluetooth device with a PAN?
If the device to which you want to connect supports only Bluetooth communication in Personal Area Network User (PANU)
mode, you cannot connect to the device with a PAN.
Why can't I use the Bluetooth utility software when I switch a user?
If you switch a user without logging off your system, the Bluetooth utility software will not work successfully. Be sure to log off
before switching a user. To log off from your system, click Start and then Log Off.