You DON'T need to instal Mozilla or forefox or anything else. Once you have download the IE7 install file you NEED to completely uninstal IE6 or whatever IE you had previously and then Install IE7 . If you don't do a clean install of IE7 parts of get corrupted . A virus or intrusion isnt causing the Error report but it's always a good idea to run a scan after an install.
Robp
January 2007