Toshiba Bluetooth On Sony VAIO VGN-SZ48GN

At the moment I'm looking after a Sony VAIO VGN-SZ48GN with Windows Vista Business 32-bit preinstalled and am looking to in-place upgrade this to Windows 7 Professional 32-bit.

Currently the machine has the Toshiba Bluetooth stack installed and Windows 7 Upgrade Advisor says that for some Bluetooth components it doesn't know if there is an update for Windows 7 and for others that there is a "free" update available from the manufacturer ("Toshiba").

However I know that updates from Toshiba are free only for Toshiba laptops and Sony has no sight of a Windows 7 driver anywhere. I think based on the Windows 7 Upgrade Advisor that I have version 5.0 of the Toshiba Bluetooth stack currently installed.

Does anyone have any experience upgrading these VAIO machines to Windows 7? Will Bluetooth work seamlessly after an upgrade or is there more to it?

Bluetooth is the only reason that I'm wary of upgrading to Windows 7, otherwise the upgrade advisor gives a completely clean bill of health.