that the whole screen display moves?
Or do you mean the window you are working on, (eg a window of an MS Word document that is smaller than the desktop), moves?
If the latter, then that's one I have not heard of before, but if the former, (the whole desktop display moves), that sounds to me like a monitor problem, either a faulty montor or a video driver.
Have you tried adjusting the screen resolution to something higher? (Right click empty desktop, select Properties, Settings tab, move the slider under "Screen resolution" a notch at a time to the right, then click Apply, OK, then test it.
I recently purchased an HP Pavillion DV4000 (Customized) notebook, OS Win XP Home Edition, and I've noticed that while typing in various programs like MS Word, Email Programs, or text boxes such as this one, the window will often move up and down while typing (as if it were adjusting or something). I have done everything I can think of to fix the problem (including reformating and reinstalling xp), and HPs support has been no help. I wanted to know if anyone else experienced this problem and if it's something I can fix (the scrolling is really annoying), or if my computer is defective and needs to be returned to HP. Any info would be great, thanks.