I have the same problem with my laptop touchpad sometimes, it keeps just going to the left of the screen and wont go where i want it to, i just rebott and it works again.
Yeah i have dont the maintence bit, its really pi**ing me off because i have to reboot and lose all the files up on my screens because it happens all of a sudden.
Its the built in one, it wont let me do any uninstall, reinstall, or anything like that, i have a laser one pluged in, but i dont always use it, when im traveling and such