I have Norton AV 2006, can I upgrade to N.I.S. 2009 ?

I have 3 months left on my 2006 subscription.   It said somewhere that I can upgrade to 2009 for free.  Is that right?   Is this an anti-virus package?   I don't want anything taking over my whole harddrive.   I already have a firewall even though I use the Norton 2006 firewall as well and like it very much.   I just don't want it messing with the registry and stuff.   Can someone explain the difference between  N.I.S.  2009 and Norton 360 and the other products?  I'd just like anti-virus unless you can convince me I need something better.  

Message Edited by morph99 on 10-25-2008 06:40 AM