It forced me to download Acrobat Reader XI to view certain PDFs online. Now, when I use Mozilla after using Reader XI, it substitutes erroneous characters for whatever I try to enter via the keyboard. No matter what I try to type, it enters "1234567890*#......" etc. When I reboot, everything works OK until I use Reader XI. The problem then re-emerges. I still have full Acrobat X on my system and the problem does not happen as long as I remember to use only Acrobat X, and not Reader XI.