I have the same problem, it just goes wild now and again and flies all over opening applications when I touch the pad. I have to press escape button several times to stop it. Mine is on the Advent 7065, rather annoying I have reinstalled the drivers and it still does it.
lots of my colleagues have had similar problems with their Dell Latitude D600 laptops, but I.T. support never came up with a definitive fix. You could look under touchpad settings and disable the tapping function. Or disable the touchpad entirely and use the nipple thing in the middle of the keyboard, or plug in an external mouse. Alternatively see if there's a newer driver on the Dell website and install that. Alps touchpad I think it's called on mine.
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