If you still have your old computer running you can get the serial numbers from the G3 launcher. They are displayed in the upper-right corner. Or you can click in the G3 menu "help->about."

As for the program data, you can try copying this over from "C:\Program Files\RealFlightG3" and "C:\Program Files\Common Files\KnifeEdge" but I can't promise you success. Registered users can get replacement CDs by contacting RealFlight tech support at http://www.realflight.com/techsupport.html