I have Windows 7. I installed the Dragonborn and Dawnguard DLC and since then an extra mouse cursor appears on the screen whenever I point the mouse to the left or upper side of the screen. It doens't appear in the right or lower side of the screen if I point the mouse there. This happens all the time, not only after alt-tabbing. Also, my screen freezes in combat whenever I click while the extra cursor is in the left or upper side of the screen. I can only find fixes for the double cursor problem after alt-tabbing, but nothing for this problem. How do I fix this?