-----------TOP TEN ANTIVIRUS SOFTWARES--------------------
1. Kaspersky http://www.softpedia.com/get/Antivirus/Kaspersky-Internet-Security.shtml
2. BitDefender http://www.softpedia.com/get/Antivirus/BitDefender-Total-Security.shtml
3. ESET Nod32 http://www.softpedia.com/get/Security/Security-Related/Eset-Smart-Security.shtml
4. AVG Anti-Virus http://www.softpedia.com/get/Antivirus/AVG-Free-Edition.shtml
5. F-Secure Anti-Virus http://www.f-secure.com/small_businesses/evaluations/
6. Trend Micro http://www.softpedia.com/get/Antivirus/Trend-Micro-AntiVirus.shtml
7. McAfee VirusScan http://www.softpedia.com/get/Antivirus/McAfee-VirusScan.shtml
8. Norton AntiVirus http://www.softpedia.com/get/Antivirus/Norton-AntiVirus-Final.shtml
9. Avast Antivirus http://www.softpedia.com/get/Antivirus/Avast-Professional-Edition.shtml
10.Panda Antivirus http://www.pandasecurity.com/homeusers/downloads/
If you want free, then I would recommend AVG or AVAST.
Choose one among them yourself.
THIS IS JUST THE REVIEW I MADE WITH MY EXPERIENCE. IT MAY DIFFER PEOPLE TO PEOPLE!!!
PLEASE NOTE TAHT THIS DATA MAY CHANGE AFTER FEW WEEKS!!!
If you wanna follow what I do myself, get Kaspersky Internet Security 2009 (recently released) it has all the four security functions. Go and get it.
That will help you the best. You can get one year free subscription for a genuine license key too from these sites. [100% genuine]
http://www.techsnack.net/get-free-kaspersky-internet-security-license-key
http://www.raymond.cc/blog/archives/2008/06/09/free-1-year-kaspersky-internet-security-2009-version-8-license-key-for-subscribers/
http://www.mymytech.com/free-kaspersky-internet-security-license-key/
Good Luck !!!
Thanks!!!