Hi touch25
What is the specific model of eMachines laptop you are using?
Most modern laptops will provide an option or keyboard shortcut to accomplish this.
The following Keyboard shortcuts have been known to disable the touchpad on various systems. Press and hold the Fn key and then press either F4, F6, F7, F9, or F12to disable the Touchpad.
Read the manual for your system specific instructions or contact the laptop manufacturers support.
eMachines Support - Contact Support:
http://support.gateway.com/us/en/emac/options.aspx
Regards