I am currently using a Logitech USB wireless mouse on my old and raggedy Dell desktop that is about 10 years old. I bought a new Logitech USB mouse with unifying receiver and the computer will only recognize the old mouse and not the new one. The old one is worn out and not working properly, that's the reason for the new one. Is there any reason why the cpu won't recognize the new mouse? I've tried other USB ports, and nothing. Mouse didn't come with any software, just said plug in and go!