Symantec's Norton AntiVirus 2005 is the world's most trusted antivirus solution. It removes viruses, worms, and Trojan horses automatically - without interrupting your work. New Norton Internet Worm Protection blocks certain more sophisticated worms (such as Blaster and Sasser) before they enter your computer. Norton AntiVirus can also detect spyware and other non-virus threats
Commercial software for Windows 98/Me/2000/XP. Mainly used as a firewall and anti-virus checker, but has ad blocking and parental control capabilities.