Hi
Keep 5.0 update 6' and uninstall the other older versions
I am not sure if you can uninstall just the antivirus part of mcaffee and still keep its antispyware,
Norton is not well thought of in the antimalware help forums.
In my opinion its best to rely on SpyBot, Ad-Aware and possible spysweeper for antispyware.
Its always best to only have One antivirus one firewall and one antispyware resident, you can still run adaware/spybot or spysweeper to clean up just dont use all of there resident type protections at the same time.