I have a dell pc with xp media edition. I changed my computers theme not long ago and decided to change again. When I did the second change, it developed a white rectangle in the upper middle of my screen, that is not all. I also have stairsteps of a transparent type from the lower right to the upper left of the screen. I changed it back to a simple theme, but the extras are still there. What have I done to it to make it do this, and how do I undo it? I have had this as an ongoing thing I keep trying to figure out on my own for almost 1 month now. I have tried system restore with no change as the result so that is not the solution I would say. any body got any ideas?