Let me help you!
After U installed Xbox360_64Eng.exe and pluged in your Receiver (make sure that U plug it in the back panel of ur PC), go to Device Manager, there will be a device which show up as a "Unknown Device" with a yellow "?". Right Click and choose "Update Driver
Software ..", then "Browse my computer for driver software", then "Let me pick ...", then choose "Xbox 360 Wireless Receiver for Window", and do what u have to do.
Now turn on your Controller and enjoy gaming xD!
(Sorry for my bad English, I come from VN xD)