Need to turn off computer voice describing every single mouse activity?

How do I turn off the voice that says every single thing that my mouse clicks or hovers over?  We changed the batteries in our Dell delivered mouse (Inspiron all in one computer, 2013) and now a robot voice describes EVERY SINGLE THING that mouse sees, points to, hovers over, EVERYTHING!  How do I turn this off? Help!  Beyond irritated.  Thanks.