I used the Microsoft one for Windows 7 64-bit. from here;
http://www.microsoft.com/hardware/en-gb/d/xbox-360-wireless-controller-for-windows
Shows up as driver version 6.3.9600.17054 (dated 17/03/2014) in device manager.
Have done this several times on several win 8.1 machines. Won't sync with pads. I can get the receiver to work on win 7 machine's