I also have to track down why the touchpad keeps moving my cursor all over the place when typing and randomly highlighting text/deleting text... I may just disable the stupid touchpad, to be honest. I use a mouse anyway, and if the touch pad going to misbehave, then it can go sit in the corner for a while!
Hmm, does your computer have a setting to disable the trackpad when another mouse is present? I know there's such a setting on Macs. There used to be one to 'avoid accidental input' when typing too. I actually love my trackpad. What's funny though is I do sometimes use a wacom tablet for things, but I keep going back and trying the built in trackpad to select menus, and it and the tablet fight with each other when I do that.