I have the same DFGT, and no problem, everything works perfect. my confi, win xp sp3 + lfs Z15 + logitech profiler 5.04.110 / 2009 all perfect, en option lfs all original and work a 450º perfect.
Tip: Formatting PC and reinstall everything from 0.
pffff 1 car new in 2 years ; we need more cars, we need new and more tracks, new game modes, examples: Nordschleife, monza gp, audis rs, porsches gtr, mode race 24hrs ... etc.