Scrolling problems in Explorer

I have a problem when trying to scroll down in Explorer through the different
files. It is possible to scroll down but as soon as I release the bar or stop
scrolling with the scroll wheel the window returns immediately to the top
view.
I have never experienced this before and thought that it could be the mouse
but the same things happened when the mouse was changed. This is the first
computer I have with Vista home premium.
Is there any settings to avoid this or is it I do wrong. It is really anoying.