agrivateing Mouse Problems

I have had a little trouble with my laptop mouse pad. It started repositioning my curser every now and then at the begining of the line of what I was typing and that was it. then about a week ago it started jumping about one to two inches every now and then. I started looking at this site and read other posts about the same subject but can not find a good answer for the happenings. i tryed a firus scan on every thing possable, tryed disabling the mouse pad and plugging in a USB mouse, and it is getting stedaly worse. In fact this is the third time i have typed this because the mouse would wonder off to the Back button and click it. I am baffled by it.

I am using Vista Premeum on a less than a year old laptop. I cant find a good reason why it is happening.