Id advise an update from 2002 to the latest verion, actually, with the bloatware that it has become I would sugest using avg
www.grisoft.com and its free....
I use the corporate edition, I hate the latest versions of security suite etc..
its worth rembering that althoguh these updates just magically appear. there is a team of people who spend there time creating those updates. they have famillies mortgages etc.. so £21 is a small price to pay IMO