ubuntu hangs /crashes whenever touchpad is used.

hello to all
I have a Compaq laptop ( c795tu) .Ubuntu 9.10 runs perfectly on it except for one problem. Whenever I touch the touch pad the system crashes . The caps lock led indicator starts blinking and i think it would remain doing so forever if I do not force shut-down the laptop by pressing power button.during this time (until I restart it) nothing will respond, keyboard, touch pad, mouse nothing.So I have to use a usb mouse to work with it.If I don't touch the touch-pad nothing will happen , it will run smoothly for day /night even for years, I think.
touch-pad --- Alps Touch-pad
thank you .

No one have any experience with this kind of problem.

Well, that sounds like a kernel panic. Which is a little odd. Has this happened forever or did it just start happening?

It actually happening since the installation of 9.10. with 8.10 it happened but with wifi .