Not too sure about the windstar. I just recently purchased a 2003 Expedition though and the past owner didnt remember what the keyless entry code was. I called our local Ford Dealer and was told that it would have to be connected to their computer and they could input a new code of my choice. I brought it up, no appointment needed. Took 30 minutes, and $25.00....
Hope that helps!
Wes
keyless entry code
