Still 2008. How do I upgrade?

Ok, so recently I was getting an error ( something along the lines of 3052,1 I think. ) and I read the steps on how to remove it, which required reinstalling Norton. I reinstalled Norton from the CD, and I bought that CD in 2008. Now, I'm stuck with Norton 2008, and I don't know how to upgrade it to the 2011 version. I've ran live update 5 times in a row, and it's not upgrading. I have no clue what to do, and I want to know if there is any difference in protection from the 2008 and the 2011 version. I used to have the 2011 version.