Assuming you mean Matt Clements, if you bought the $25 serial version that is supposed to work with Win XP and it doesn't work perhaps you need to contact him. If you bought the cheaper cable it never will work with XP.

It might help if you give a slightly more detailed problem description than "BUT NO GO>". E.g. what menu options are you using in FMS and what do you see in the calibration screen ?

Steve