Problem using ps3 controller on my pc

[triptych]

wopp convinced me to use this for roms last night, it's still a good idea but for some reason, the pc doesnt detect that the controllers analog sticks are there

i can use the L3 and R3 buttons, but i'm required to use the dpad for movement/aiming, which is really annoying. anyone know how to fix it?

or what the problem is?