Hi Michael:
It's probably the Disklight extention at "SYSTEM FOLDER:EXTENSIONS".
You can drag this to the trash. There is also the Filesaver control
panel at "SYSTEM FOLDER:CONTROL PANELS", if you are trying to
uninstall completely.
If you haven't updated your NUM software to NUM 3.5.2 that could be
causing your problems. There was an update released for OS8.0 and
another for OS8.1. The updater is located at this link:
http://www.symantec.com/techsupp/files/num/norton_utilities_version_3x_for_macintosh.html
Run the updater on an installed version of NUM 3.5.