Am in big trouble. I open an excel sheet and as soon as my mouse is on the document it adds columns to the right endlessly. Only stops when I move the mouse outside the document. Cannot make any changes or whatsoever on the document. In word everything moves to the right and the document view is larger than before. Tried zoom in /out because I read it on the forum. No change. In firefox - if I fill out a form or want to see my options/pick from a menu (with an arrow to click on, drop down menu) - I see it for a second but cannot make any choices. In Photoshop I wanted to change the image size. Before I can enter a number or even touch anything the numbers start to increase by themselves - endlessly. I am still ably to close those applications/programms. One time the screen froze - could not do force quit or anything else. It seems to get worse day by day. Started with excel..... Am pretty desperate!!! Anybody there to help???? Am on MacBookPro OS X 10.4.11.