ugly_bob:
I won't say you're mistaken in what you say about Norton because I learnt about this trick when I was having problems with Norton myself.
What happened was that I had a copy of Norton SystemWorks 2002 installed on one of the PC's at home and I wanted to upgrade to NAV 2006 and NIS 2006. Like
everyone else, I found it impossible to completely remove all the components of the program using the standard methods.
At the University where I work, we have a couple of ex-Symantec technical boffins on the payroll. I took the problem to them and they told me in an instant what to do.
Their method, which I have related above, worked like a dream.
Curiously, they did tell me that from their experience, hardly anyone ever thinks of trying to remove Norton via msconfig.