Hi All, I am running xp home with sp2. I booted my computer today and found that the mouse behaviour has changed. I have to turn the mouse 90 degrees to the right to move the pointer predictably. I.E. the pointer will move right to left when the mouse is moved up and down and up and down when the mouse is moved left to right. This is extremely annoying. I am unable to find the setting to change the orientation back. Please - if you know how to fix this tell me - it's driving me nuts. Will.