Used Norton Utilites V15 now Firefox 9 will not fully load

Have just done a clean up using Norton Utilites v15 and now Firefox v9.01 will not fully load pages, it just will not load most graphics it just hangs or loads without graphics.  This make navigating sites pretty difficult.. It has obviously removed a required file (but which one) and for the second time in a week it looks like I will have to remove it completely and lose all passwords and bookmarks.  It doesn't affect Explorer but I don't want to use that browser i am a dedicated Firefox man.  Please is there anybody out there that has the same problem.  I have checked all plug ins and they are up to date.