slave_screams: [...]
mouse pad on my laptop [...] I've heard how good this game is and really want to
play it properly!
This does not make any sense to me.
To adress your question though, can you play other first person shooters with your control scheme? I'm thinking your problem is with how your laptop works or possibly the software it uses to emulate mouse input. Can you move the mouse cursor while holding down W or other keys outside the game? In other games?
Perhaps there is some third party software running to keep your keyboard and touchpad fully "functional" (special buttons, sensitivity settings etc) that overrides regular Windows settings. Knowing what laptop you are using and potential software used for the built in keyboard and touchpad might help troubleshooting this. If this software thinks that pressing keys while in the game means you are typing, perhaps this program hides ir disables the mouse cursor or even all mouse input while keys are pressed. Another useful thing to test: Run the game in windowed mode as opposed to full screen and see if it makes any difference.
If you are serious about playing games though, don't bother troubleshooting this and just get a mouse. ANY mouse is better than swiping fingers at a touchpad. Your game will improve and you will not wear down your finger tips.