Sticky mouse. Hi I have a sony vaio VGN-NR220E model laptop and sometimes my mouse is sticky. I

Question

Hi I have a sony vaio VGN-NR220E model laptop and sometimes my mouse is sticky. I learned how to disable the tapping so its not sensitive, but every so often, i will try to scroll with my fingers on the touchpad and the mouse will just go in the opposite direction (erratically) instead of where I am pointing/scrolling it. Help!