Just today, while my dad was using his computer (ASUS Eee netbook) it looked like it froze up. But it only froze the cursor. The whole computer was still running and only the mouse cursor was unresponsive. The strange thing is that it only does that on his user. All the other users work just fine. So that means that the track pad is not broken. My best guess is that it's a virus.
Do you have any advice on what to do? I'm guessing that it might just be a background process that constantly disables the mouse's movement. But I don't know.