I have windows XP. I have a USB optical mouse which is wired and works fine. I have just bought a wireless optical mouse and keyboard. I installed the drivers for both the mouse and keyboard and neither worked. Then i noticed in the instructions that is said to uninstall the old drivers for the wired mouse and keyboard.
I was able to uninstall the drivers for the keyboard and when i rebooted the computer the wireless keyboard worked fine. But when i tried to uninstall the driver for the mouse (i selected mouse from the control panel --then hardware--then properties--then driver, then uninstall driver button) the mouse stops working -which i expected. So i remove the usb mouse from the computer and reboot, but the computer does not work with the new wireless mouse.
I can still plug in the usb mouse and it works fine after rebooting.