Can only push one or two buttons at a time on keyboard?

When you think about gaming on a computer, a lot of times you have to push between one and six buttons at a time. The keyboard on my laptop only seems to be able to register two at a time, and i cant use the arrow keys and the letters at the same time. it also has the tendency to disable the mouse pad for a few seconds after i push any keyboard button. Is this normal? Is there any fix to it? i would really like to be able to play my games effectively, but this is making it nearly impossible to play anything.