goto logitech website and download the new lgs software or use the cd that came with your g25.
if you install the software a point will come when the installer prompts you to connect the hardware now. then the software will recognize the wheel.
you do not need the profiler application, only if you use different games with different wheel settings, than it will change the settings for you if you start a game. just like the game profiles in nvidia drivers.
if your wheel is working then goto windows properties gamedevices and set it up for lfs: wheelturn 720°, ffb 101% (this prevents the wheel from shaking on straights), damper and spring 0% (not needed by lfs), centering spring checkbox checked but value at 0%.
in lfs setup your axxes and kobs, ffb anywhere from 30%-150% depending on the car an how much you want to work the wheel.
happy racing...
peace mo