When using my 360 pad on my laptop to play (via usb), it the game becomes very jittery and pretty much unplayable when I try to attack someone, you can see the tutorial flashing in the middle of the screen switching from xbox controller button to keyboard. this only happens randomly, and i don't know how to fix it. i assume it's a problem with the game not know which to process, the pad or the keyboard. anyone got any help? much appreciated