I'm not understanding the "work properly" part. What about it do you think is NOT working properly, i.e. as designed to work or as advertised to work? It's one thing for the machine to fail in what it is supposed to be able to do, but another for it not to meet what may be errant or unreasonable expectations of the owner (possibly without regard to the machine's design or stated functionality).
If you are trying to move the cursor and no hand is touching the trackpad except for the one finger, then there may be a problem.
I'm not painting you either way just yet, I just don't grasp the exact nature of your complaint. I scrolled back to read your message and what I saw often is solved by the tip I gave about accidental trackpad input. Also, I learned early on that the manner in which my left hand tended to hang near the trackpad often caused the thumb inadvertently (and unkowingly to me) to touch the pad, thus rendering the cursor motionless because if the right hand also touhed it, i.e. tried to move the cursor, all that would happen is the page would attempt to scroll one way or another.