The sony laptop comes with bluetooth, but I disable it for the sake of safety.
When I got a new nokia mobile with bluetooth, I can not switch on it anymore.
It does not show on Device manager, nor in “Sony control center”. However, bluetooth really exist, since I can use it in Ubuntu.
After huge effect, I find it can be turn on by VAIO smart network. Which does not show up in system tray.
Solution: services.msc enable 2 blue tooth service, and most important:
VSNService (VAIO smart network) So you can see it in tray.
Double click it, you will get the soft switch of bluetooth. –> get connected all done
Share with friends who got similar problems: Can not find blue tooth on the sony vaio Windows 7.