Can you afford $9.00 ? I just searched Google and found Norton Anti-Virus at this site..
http://www.softwareoutlet.com/Merchant2/merchant.mv?Screen=CTGY&Category_Code=SYMS-SFPlace is software outlet If I were you buy it there I am Using Mc Affee but I also use a firewall You can download Zone Alarm free version but I would check this Softwrae outlet looks pertty affordable !
and If you was doing Macintosh you people get to pay thru the nose $19.95 heh heh heh !
anyway good luck !