How to disable laptop touchpad

Hello,

i want to know how to do disable touchpad:
windows xp
laptop hp 620 notebook

it doesn't have a button to disable touchpad.

i tried something and worked in windows nut it didn't work in many games u know i have
another mouse to play with so the touchpad sometimes move the mouse when i touch it by wrong way.

anyone have a solution to completely stop this.


(thanks 4 reading)
(hoping 4 solving)