I have had a few clients that have had issues with Norton, either they just crapped out and wouldn't let them on the internet or configure or anything, not even remove the program itself.
I have had to use this removal tool more than once.
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039
Download and run. As ususal, we are not responsible... :-)
Computer Repair Lakeland, FL