Upgrading from Norton Internet Security (NIS) 2005/AntiSpyware to NIS 2009

I am currently running NIS 2005 AntiSpyware Edition.  I would like to upgrade to NIS 2009.  What is the best way to uninstall NIS 2005 AntiSpyware Edition prior to the installation of NIS 2009?  Should I use Add/Remove Programs in the Control Panel, then use the Norton Removal Tool?  Or, is there a more appropriate method?

 

Do I have to disconnect from the Internet prior to the installation of NIS 2009?

 

Thanks,

 

John