Tawylde is right try a different mouse. Just about the only thing that will cause what you are experiencing is a mouse that has worn contacts. When the contacts in a mouse become worn you get false clicks because even though you still have your finger on the button the button does not always stay on the contacts making it click on it's own.The cheaper the mouse the quicker the contacts wear out. The only thing to do with mouse with worn contacts is to trash it and get a new one.