Today I had the same problem installing the new logitech 5.02 driver for the g25. I solved it uninstalling all the logitech software and running this application (LWS_CLRC.EXE) find it inhttp://forums.logitech.com/log ... mp;page=1&format=page that removes all the existing calibrations of the windows register.
Then re-install the wheel software and it´s fixed.