I loved this emulator! I've played FZero, Castlevania, Sonic 3, Top Gear 2, UMK3... but now the emulator seems to be broken, the controller doesn't responds, only shows the cursor of the Xbox's browser. :/ Nice work bro, congratulations!! :)
Press start or menu, click on use the game control (or something like this) button, I remember it was the third button, when you press start
