I don't need to ask a question, but had a similar problem.
My operating system is Windows Vista.
My son was playing his COD. He got a pop up telling him he needed to upgrade his graphics card. He clicked on it. I tried to play my game the next day, and the graphics were messed up. The graphics were also messed up on his game. After much of trying to figure out how to fix the problem. I looked at my computer for a second, went to the uninstall, and found the problem. I have an Ati graphics card. AMD catalist had installed on my computer on the day in quesion. I removed it from the computer, and the games were back to normal.