Alright - I'm running Windows XP on a Toshiba Latitude C600/C500 (that's what it says on the bottom). I also have Avast! as virus protection. I don't have a mouse, I just use the touchpad. However, just today the cursor started behaving... oddly. Usually it works normally, but every once in awhile it will decide to scroll diagnally across the screen, usually down & to the left. It will also do this whenever I right-click. It will stay down in the corner for around 30 seconds, and then it will work normally again. My hands and the touchpad are both clean. Any help?