Please tell me what I am missing here. After many years I am replacing my keyboard and mouse..they are no longer working. I got a new keyboard and optical mouse. I followed the directions and then put in the CD and now with no other keyboard or mouse installed,how can I even click on the button that says install? In reading the trouble shooting part of the manual,it says try uninstalling the old mouse. So..how do you do that when you having nothing with which to navigate the computer?