Do you mean if you touch any key? Or when you touch somewhere around the keys on the keyboard?
Have you tried using a USB keyboard to see if the problem is fixed by using such? If a secondary USB keyboard functions correctly, then it's possible the current onboard keyboard is bad and therefore needs replacement.
Hope this helps and let us know more.
My laptop is a HP Compaq nc8000, The screen keeps going blank when you touch the around the keys. Any way to fix it?