Turbo prop idle speed too high.

After resolving some hardware problems with my Logitech Wingman Digital Extreme 3D joystick, I've found that the idle speed on all turboprops in FS2002 is stuck on about 10-15% torque. I have tried removing all Logitech software and reinstalling it, altering the joystick main scale in FS2002.cfg, playing with the sensitivites to no avail. This problem dissapears when i disable the joystick within FS2002. My local computer guru has been no help at all. I wonder if it's a registry problem? How could I find out what's wrong ?

