You need to use a programmed called PPJoy for FMS with your TX in windows 2000/XP.
This link will tell you basicly how to install it and get it running. Some minor things on your machine may be different (such as the text in the list box in PPjoy) then are on the site:
http://www.rc-sim.de/art_engine_en/a...hp?article=118
Go down to "Configuring PPJoy for using PPM radios under Win XP", and there are the directions.
To download PPjoy, go here (you can also get more help in the manual on this site):
http://www.geocities.com/deonvdw/PPJoy.htm
Good luck!