generally speaking, the AV program that you buy is much better, but if you are careful as to the websites you visit and the emails from unknown persons that you open, either one would be adequate.. I used to have AVG free and it kept my computer clean.
Good Anti-Virus i would Recommend By Using Free Avira AntiVir Personal Press here http://www.download.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html?tag=contentBody;mostPopTwoColWrap&cdlPid=10901492
Why is Avira AntiVir Personal it is Good Than Avast ,Avg internet security 2009 ,NOD32,Kaspersky, and Norton? Press here http://www.virusbtn.com/news/2008/09_02