Norton function disabled in IE browser manage add on??

I have a laptop with Vista Home Basic and use NIS 21.7.0.11. My browser is IE 9. When I look at the manage add ons> Tool bar and extensions function of the IE 9, I see 3 Symantec items. One of the items is disabled rather than enabled. I can’t recall the name of the item right now (I am not at that laptop). But I think it’s either Norton Intrusion protection or Norton vulnerability protection. Anyway should there be any Symantec/Norton item disabled in the add-on part of IE???
Should they ALL be enabled?