If you are trying to run it on XP SP2, check post 169 and 166 on this thread:
Mixed success rate, but if you have nothing to lose except some time, give it a shot
Originally Posted by toxin
with either laptop, mine or my friends I use the same cable, which was provided along with the AP.
Both laptops detect the new hardware "Cobb Talk 2.0" The windows control panel says that it works properly.
Still, one laptop can communicate with the ECU, and the other cannot..