Antivirus
Antivirus (or anti-virus) software is used to prevent, detect, and remove malware, including computer viruses, worms, and trojan horses. Such programs may also prevent and remove adware, spyware, and other forms of malware.http://en.wikipedia.org
Norton AntiVirus
Norton AntiVirus 2010 (60 DAY FULL VERSION) defends your PC against viruses, spyware, bots, worms, and more without slowing you down or getting in your way.