Renewal with Norton.Com/NS

I bought a renewal on line with Norton Software Norton.Com/NS on 5/28/2011.  I thought everything was fine until about a when ago when I started getting automaticwarnings on my computer warning that my Norton Internet Security was expiring (now expired).  I know I bought a year subscription but now I'm wondering if it was ever updated on my computer.  I tend to do things early.  Help me sort this out.