Don't laugh now, I'm serious: Your specs say you have a Lenovo laptop. Is this happening with laptop? Are you sure you are not accidentally touching touchpad when you type? This would cause behavior that looks as if mouse would live its own life, clicking and moving pointer randomly.
This is the most common reason for random clicks and pointer movements among laptop users. Touchpad is a bit too sensitive, part of the hands accidentally touch it when typing. The best method to test if this is the case is to either disable touchpad, or use an external keyboard for a while. If random clicks and movements end, that was the culprit.