Sorry for my english but i will try to describe it in english. i don't think that this is a problem of the bluetooth device wich is internaly connectet to the usb controller that is out of function. but i can fail. under windows vista all of the usb controllers run perfectly only under windows 7 this error occured.
if you erase this device an then search for changed hardware the divice will be found and after that also the bluetooth device. then the usb controller changes to the failure. that all happens very quick.
but i think there has to be a possibility to run this controller under windows 7, don't you?