Dolphin Gamecube controller Mayflash doesn't work

I recently got the Mayflash gamecube adapter, I plugged it in my computer and in the devices and printers it works perfectly, all the button inputs are registered. But when I go to Dolphin emulator and click on "GCPad" my whole computer starts lagging and dolphin recognizes "USB GamePad" but it doesnt recognize any buttons, anyone got any suggestions?

http://puu.sh/7F0UR.png