I use Firefox and out of the blue, noticed that when I tried to play a YouTube video, I got a blank screen. I have tried using the Adobe uninstaller and then reinstalling the program several times. When I go into Adobe help and it does the test to see if you have Flash Player, I get a blank screen - even after I've installed it. In my Uninstall Programs window, it is listed but does not have a size. Does anyone have any suggestions on how to remedy this? Thanks!