The tablet/laptop I had for work until recently had the problem of the pointer bouncing around on the screen, opening and closing windows and generally rendering the computer unusable until it was hibernated or restarted. Wiping XP off it and installing Vista helped, as did mega virus work by the IT office at work, but all it did was make the occurrence of the problem exceedingly rare rather than half the time. Exceedingly rare I could deal with. Oh, and resetting the touchpad and touchscreen settings.

Then, of course, I had to deal with the pain in the butt that is Vista. Which meant I couldn't get onto wireless networks that did not broadcast an SSID (rare, but some friends are paranoid) and a few other minor PITA issues.