We had to retry it with another xbox controller and it worked. No one could figure what was wrong with the other controller or software and I decided it was best to leave it at that. (I'm an electronics designer and there are tar pits we don't go into.)
I have a dual trigger 3-in-1 but during a trip the right stick analogue moved a bit down as you can see at the left part of this image .This part is what I get when I do Panel Control > Config joystick > Properties (on the selected joystck) and there is no "calibrate" button anywhere T_T (not sur for the words since I am under a french XP system) .
I use Xpadder to play with it and as you can see here Xpadder consider that the stick is permanently pushed down (Y= -11 )
Does somebody know how to recenter it please ?