Q: How do I remove Norton Antivirus *after* I have installed Lion?

Sorry.. this site is on the Norton for the mac support site.. you can fish around for it on their site.

If you're still in school then you should be able to go to your support group at school and have them "fix it".

This will do it.  Just follow the instructions carefully.  I just did it on my iMac with Lion. 

https://www-secure.symantec.com/norton-support/jsp/help-solutions.jsp?docid=2008 0427024142EN&lg=english&ct=united+states&product=home&version=1&pvid=f-home&ents rc=redirect_pubweb

Yes I came here for this same issue.  joshuawalls has found the solution.