Does this still happen after a reboot? Do you have a gamepad or any other type of joystick plugged in? Try removing it if that's the case and/or disabling joystick support from the options. Other than that, this is not a common problem at all. I dunno what to tell ya.
Oh right, you say your keyboard is good, well, get it to the point where you see Adol moving towards the upper left all the time, and at that point, unplug the keyboard to check if it still happens.