Just found the solution from another forum
You may try it and tell me how it goes
Right click on "Computer" in the start menu and select "Properties"
Click on "Device Manager" in the left column.
Open "Bluetooth Radios"
Select "Generic Bluetooth Adapter". Open it and select the "Driver" tab.
Click "Update Driver"
Click "Browse my computer for driver software"
Click "Let me pick from a list of device drivers on my computer"
Click off "Show compatible hardware" --MS is stupid where this is concerned.
Select "Apple Inc." from the Manufacturer column.
For me, I know I have a Broadcom chip, so I selected "Apple Broadcom Built-in Bluetooth"
Click Next. Windows may try to dissuade you from installing the driver, but force it to anyway.
There saying that there is 2 blue tooth driver, one is generic by window 7 and the other is by apple.
Hi to anyone who has installed the Motion Joy drivers!
I have fixed it!!
You need delete the motion joy drivers manually before unistalling the motion joy device. Go to driver details and you should see a driver called mij.... (cant remember the rest) browese to its location, delete it and then uninstall the motion joy device. Restart your mac and it should then find the hardware as a standard bluetooth device.
Sorry that it's not the most concise guide but I figured it out by simply trying everything and was amazed when it actually worked!
Thanks, rossturville, this fixed the exact same problem for me.
I'd forgotten that I had recenly been using MotionJoy and had been playing with the Driver section in it. It installed an alternative driver with no error messages - and worked great for the purpose (using my PS3 controller). I did not realise it had made my Bluetooth adaptor invisible to Windows. (Apparently at a very low level - so strange that Windows can't see it at all - even to say whether a driver is loaded or not.)