Can boot to win xp desktop - but all icons are missing. Cannot run any program - always results in a Dr Watson error window, then desktop locks. Have to power off in order to shutdown. CTRL ALT DEL also results in an error window and desktop locks. Can run safe mode and run programs, e.g. Excel, Word, etc. Dr Watson error log reported application exception with iexplore.exe (access violation) then errors locating symbol files. Default export file being used for various windows program files. All this kicked off following a mcafee dat file update (but the error didn't occur until the following day). any ideas please?