same here, i installed the pc suite and it asked me twice for the unknown dirver thing, where you press "continue anyway" it finished.. i restarted.. plugged the phone in and the "new hardware found" thing popped up and it couldn't install any drivers. i tried to do it manually by pointing to:
c:/program files/nokia/connectivity cable driver
i also tried to install the DUK drivers that was on the CD which came with my cable.