YOU SHOULD ONLY NEED ONE OF THESE - I don't know what the difference is between these two files except size. I've tried both, they both function the same for me but they are both included on the CD. If one doesn't work, try the other.
Vibration features do not seem to work on X64.
This controller is NOT XBox 360 compatible and WILL NOT function right in most 'Games for Windows' games.