I have a Inspiron 1500, model 3558, with a touchpad oddity. Only about the leftmost ½" of the mouse button acts as a left mouse click. The rest of the button acts as a right click. Since I left-click probably 100 times as often as I right-click, this is very inconvenient. Dell Tech Support was completely useless when I called in. Does anyone know how to adjust this setting, if it is adjustable?