all you have to do is the fn key, and the F7 key at the same time, to disable the touchpad on a laptop. you can enable it again by doing the same thing again
On the Acer Aspire 4330, you can try to press the "Fn" key and the "F7" key at the same time. This combination locks or unlocks the touch pad, enabling or disabling its use. If this doesn't work, try...