You mean when you are in a web page or a long document it scrolls to the bottom of the page, then back up and keeps doing that back and forth? Or does it just scroll down once and stop at the bottom?
Do you have a laptop? Did this always happen? If not, when did it start? Did you install Windows 7 and started right after that?
It scrolls up and down and after a while it stops and just when you start to do something, it scrolls up and down again.
No, I don't have a laptop and it happened just recently. I've been using Windows 7 for several months now and this thing just happened very recently.