Uh, yeah... :-) Searched for Norton and Symantec AND 'NAV', rebooted and it's almost, almost gone... :-) In fact I only hear the faintest of muffled screams in the background...
One manifests itself in a message box that pops up when I start Word - you know the ole' familiar 'Norton yada yada yada doesn't support the Repair and Install feature'... :-)
The only answers I've found on that one involves installing LiveUpdate... <ROFL> I think Joseph Heller must've written the Symantec Customer Support routines... Now The MS site explains that it's because the Norton Antivirus DLL is loaded. Well, I could fix that,
if I just knew what it was named.
Now I've ripped out the guts of NIS - All of its folders are gone and erased, all visible traces are eradicated from the Registry, all Norton toolbar options and ctlpanel entries. And whaddya know - the machine performs like a dream. Starts up much faster, shuts down much faster, generally seems to breathe easier...

APC, AVG & Sygate are protecting me, the sun's shining and life's lookin' good...