I had a problem here too on my Vista x64 with a Btoes 1.2 (Msi).
I've downloaded the Bluesoleil 5.0.5 here : BlueSoleil, 22 million usersâ€™ choice for Bluetooth software, Bluetooth driver
So now it's runing. Notice that you have to reboot your computer after installing, and at the same time i did turn off the driver
signature verification because i think it may cause problems with this old hardware
Anyway, try to reinstall the driver, turn off the driver signature, reboot, install the driver found from the Msi website, then install blue soleil and reboot.
I hope this would help !