The problem could be a result of many different potential issues, from a bad, or incompatible, or unnecessary driver installation, to, in the case of a wireless mouse some type of external interference, to, in the case of an optical mouse, a bad or reflective surface that is resulting in bad bounces. If you could please advise as to the manufacturer, model name, model number and any version information as well as how it's attached, maybe someone here might have had similiar issues, or may know of specific steps to correct your problem