Sony S 사용자 설명서

I cannot connect to a Bluetooth device in Personal Area Network User mode

If the device to which you want to connect supports Bluetooth communication in Personal Area Network User mode only, you 
cannot establish a connection from your computer.

I cannot use the Bluetooth Utility software when I switch a user

If you switch a user without logging off from your system, the Bluetooth Utility software will not work successfully. Make sure 
to log off before switching a user. To log off from your system, click Start and then Log Off.