Why am I still at version 17.0.0.136?

I bought this HP computer (Windows 7/64) a couple months ago with NIS 2009 installed.  I liked some of the footprint improvements Norton has made so after the trial version's time was up I renewed and updated to NIS 2010. That was about a week ago.

 

Problem is, I've got version 17.0.0136 and the update center claims I have the latest version..Something that obviously can't be true. I haven't received any patch and I've run live update on numerous occasions.  How do I get updated to 17.5 or whatever in the heck it is?