keith124 is advertizing his over-priced RCJOY ($90, ouch!) by pulling old posts. I bet Ragz found something in 10 months since he posted his question.
If not, here's a better place where you can buy an interface, which work with FMS (or any other sim, including RealFlight) and is compatible with any Windows version, including 2000/XP:
http://www.milehighwings.com/joystick.htm
And it costs less than a half of RCJOY.