If you have Norton 2006 or Norton 2007, you don't need to buy Norton 2008. Just renew your Norton 2006 or 2007 then take advantage of the "free" upgrade to Norton 2008.
That is if you have active subscription with your 2006 or 2007 edition or if you renewed it.
You can download NAV 2008 from their website.
Uninstall Norton 2006 or Norton 2007, then install Norton AV 2008.
The product key of Norton 2006 and Norton 2007 is applicable to Norton AV 2008 because they offer free upgrade to Norton 2008.
If you are happy with Spy Sweeper then you'll renew too. It should offer you support, updates and upgrade to newer version if you have active subscription or ask Webroot they have discount for existing customers if they don't offer free upgrade like Symantec do.
See similar discussion at Calendar of Updates:
Or just go to http://www.symantec.com/norton/blog/detail.jsp?blogid=performance_impact&profileid=tom_powledge
I am soon up for renewal for my spy and ant virus protection, Nortons and Spysweeper. Should I just renew or buy those newer version they are trying to push on me? I haven't had any problems with either of them so why buy a new 2008 version. Oh and I am not going to download any new programs that are free or better mainly because I believe in what ain't broke don't fix it and to be frank unless someone is willing to come over to my house to install new anti virus and uninstall my old ones and insure I have no problems with the new programs forget it because I am not really up to doing it. lol. Maybe when I am fully recovered but not now I just want to know about the Nortons and Spysweeper for now. Thanks