Norton's is a pain in the ass, very true. Unfortunately people are afraid to try other things if they've used it for years and "love" it.
Refusing to work on a system that uses it, tho, is imho not exactly condusive to business if you are in the business of working on computers and networks. I'd never recommend it to begin with. I try to convince people to switch to something less intrusive, say panda or avp or something else, and give them reasons why. That usually works. But if they won't, well I'd never turn them down.
I have a system I use to test different things and I tested Nortons system works 2005, pos (piece of shit). 2004 firewall really blocks a lot of stuff but, like all the rest of nortons, is very intrusive and slows the pc down quite a bit.
Norton's has a tool to remove it but it never really does get all the nasty little bits it leaves behind. If it becomes a problem, I wipe out the pc and be done with it. That usually convinces people to change.
