Satellite touchpad problems

Hi, I have a satellite a135. it has been great for two years and suddenly the touchpad has issues. While using, it switches from maximize to minimize etc. also the curser now has a small scrolling icon which appears whenever it wants. the switching between screens is not every time i hit is, it is like every 5th time or so, and it is driving me nuts!! I reset the touchpad to default, no change, restored my computer to a few weeks prior to this starting, nothing. One other thing, out of the blue, the touchpad icon started appearing on my task bar. It seems to happen most when on the scroll bar top or bottom. any assistance would be great,I have no idea where to start. Other than that, the touchpad works great.

 

Does a usb mouse also do this?

If not, touchpads can be replaced.

If yes there is a software problem.