17 R5, touchpad registers a click when you move off target

My Alienware 17 R5 will not respond to a single touchpad click. Normally it takes two or more, however, if you click once, and move the mouse cursor off the target (the button you are clicking) it will register a click. The touchpad will also register repeating clicks when you click twice on a side window slider, making the window slide down very quickly as if you are rapidly clicking. This leads to mouse clicks that are uncontrollable and unpredictable.  Sometimes just moving a mouse off a button will cause a click. I have tried to reinstall the  drivers to no effect.