Race driver grid doesn\'t detect my USB PC Controller?

check in the controlers menu. i think it will be the last 1 you can select if its being seen.
if its a direct input device it may not work. look for the 360 pad emulator and try copying the x-input1_3.dll or 1_8 or 1_9 not sure which 1 it is but 1 of them will force a none native controler to respond like a 360 pad.