eliminating Norton

[Dr. Trevor J. Hutley]

Some time ago, I (thought that I) removed "all" 
Norton/Symantec/Systemworks files from my Al-book.

At start-up (I just downloaded Airport 3.2.4), I noticed that a 
message appears, saying:

	Norton Utilities

	Norton Utilities has detected a new version of Mac OS X.
	You may need to update your instaled Norton Utilities or Systemworks.


WHERE is this Norton file/message lurking in my Al-book?

Why does it think I have these Norton products still installed?

Does anyone have an idea what I need to look for and remove?
So as to ensure this message does not apppear, and so that my Mac is 
definitely Norton-free.

regards,  Trevor