I tried ALL of the internal Lenovo-supplied utilities, and even "upgraded" to a generic driver provided by Synaptics (maker of the trackpad hardware). Moving the mouse cursor around the screen was usually not a problem, but scrolling and click-and-drag (to say, move a file using the GUI) would only actually work about 70% of the time. Instead of scrolling it would stutter and zing about, and instead of click and drag it would pick up the file and drop it some other place. It's actually a bit hard to describe, since it actually made me genuinely wonder if there was something wrong with my hand/brain. Tiny little errors for such a critical thing really do cause havoc.