I downloaded the FF update from mozilla.org to my desktop even though it says it's a binary file with an unknown publisher. When done, I clicked on it and a window came up to ask if I was sure I wanted to open it because the security certificate showed it came from an unknown publisher. So, I closed the window without running it and intended to scan with Norton Internet Security, but when I right clicked on it, a Norton window came up to say 14.0.1 setup.exe was ok. When I clicked on setup again to run it, a small window came up saying the file was corrupt and prevented me from opening it. I then deleted the file. FF was working fine before the update. My OS is Win XP Please advise. Thanks, Lynn