keyboard and my joystick

i have problem
with keyboard and my joystick

in at games i can't press 3 keys in keyboard at same time
like in James Camerons Avatar The Game
i can't press ( w + shift + space ) at same time the windows make sound but not make the move . and when press this i can't press ( d or a ) too i must play with 2 keys only ????

and in fifa 2011 me and my brother play with joysticks
alot when we press alot keys at same time ( 3 keys )

i fell like my hand not work untill he stop press his key
then my joystick work but if he keep press his key my hand not work like keyboard

i don't know what the problem

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