It's so easy.
1.uninstall motioninjoy(ds3tool).
2.connect both usb bth dongle&gamepad via usb cable.
3.open device manager as administrator.
4.find the gamepad and uninstall it, then do this for bth dongle too.
5.remove both bth dongle and gamepad.
6.connect them again.
7.let Windows to install their driver(make sure that you have internet connection ).
8.It's done.
I do this steps even without rebooting pc.
1.uninstall motioninjoy(ds3tool).
2.connect both usb bth dongle&gamepad via usb cable.
3.open device manager as administrator.
4.find the gamepad and uninstall it, then do this for bth dongle too.
5.remove both bth dongle and gamepad.
6.connect them again.
7.let Windows to install their driver(make sure that you have internet connection ).
8.It's done.
I do this steps even without rebooting pc.