Context Menu Oddity

I have recently reinstalled Win98se on a clean harddrive (partition – format – install). Win98se is fully updated & patched as of 6/1/2002. I’m running IE 6 & Office 2000 SR1. The software configuration is standard for me, the reinstall was due to some incompatibilities with Norton SystemWorks 2002.
Long painful story – no longer using NSW 2002, reverted to updated / patched NSW 2000!

My problem is that my Context Menus show duplicate entries (ie: ‘Scan with Norton AntiVirus’ appears twice).
I install several programs that add a Context Menu entry (these have always behaved well in the past), so my Context Menus have gotten VERY LONG.

Can anyone give me a clue as to what’s going on here, and / or tell me how to fix it?