I have a Lenovo T60 Thinkpad. It has a toggle button in the keyboard which I usually use to move the pointer. The laptop also has a traditional mouse pad which has now stopped working completely. It stopped working when my laptop one day had a popup which said that it had successfully installed a new mouse, even though I don't have a separate mouse and didn't know what it was talking about. The touchpad hasn't worked since then, I guess it is disabled. How do I turn it back on? I can't find it in any of my devices.
Added (1). When I go into device manager, the only thing under mouse section is a PS/2 compatible mouse. I tried uninstalling that, but as soon as my laptop reboots, it automatically installs it again. I have Windows 7.