The Data on your Z22 is rock-solid safe, but unlike the answer that states to do a RESET- DO NOT ! The touch screen problem has nothing to do with resetting, it is a failure of the soft plastic top layer of the touch screen. There is a tiny, remote possibility that the logic circuits are out of sync and the touchscreen really is mixed up in a software state, and a SOFT RESET may reset the touch screen, but this is almost unheard of ( but does happen).
I have an entire page on the Z22 and how to maintain, repair and interface it. It is at:
I would suggest trying a few tricks listed on my web page, and see if you can get the screen to work again. It is IMPERATIVE to get a hard plastic cover over the screen to keep it working!
Please read over the information on the Z22 page.
robin dusty graves
Z22 PALM PILOT