I use to have my touchpad scroll up/down and even left/right. I had to reinstall Windows Vista, update all windows updates and cannot figure out how to add scrolling options or download another driver to support scrolling.
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If you have the Synaptics touchpad drivers installed (this is on xp, but probably similar enough to vista that you can figure it out) and your touchpad is capable of it... control panel, mouse, device settings tab click settings and it will open up a Synaptics control panel with the settings you need.
If you don't have the Synaptics touchpad drivers installed go to the manufacturer's website for your laptop... they'll have the drivers.