disable "At Risk" alerts for firewall

I'm running Norton Security for Mac 7.3 and the firewall is dreadful and buggy, and support can't figure out how to fix it.  So I'd like to disable Norton's firewall and use the firewall built-in to the operating system.  Consequently, Norton Security presents an alert dialog box that says "At Risk" every time I restart.  I can't find a way to disable this alert.   Please help.