Bluetooth Driver Problem

There are occasions when I want to use Bluetooth for tethering and synching between my BB9900 and Toshiba Windows 7 laptop. It is not always convenient to use the USB cable.

I know that Blackberry Desktop Manager does not work with Toshiba Bluetooth drivers, so I bought a USB Bluetooth dongle and disabled the Toshiba Bluetooth.

When I installed the USB Bluetooth, all of the necessary drivers (including the Windows Generic BT driver) installed OK and I was able to connect and sync between BDM and the 9900.
After a restart of my PC, the two devices are paired OK, but I can no longer sync and Windows says that it cannot find all of the drivers that it needs.

I would welcome any suggestions.

Thanks