My gateway laptop keyboard isnt working...HELP!?

somehow I don't know why... how can i fix this Gateway Laptop Keyboard??? i cant press 9, 0, -, =, backspace, \, [, ],enter, home, page up page down, and end... how to i fix this, i dont even know how this happened. I have to use the on-screen keyboard everytime i use it and it hard and challenging and i cant type fast.. please help me...!!!!!!! I really want to change my Laptop Keyboard, how about the Compaq Laptop Keyboard and Dell Laptop Keyboard?