Norton AntiVirus, by Symantec Corp.was one of the first antivirus products and it's still going strong today. The program detects viruses, worms, Trojan horses, spyware, adware, and more. It can even detect the rootkit infections that can be so tricky. Norton AntiVirus will scan your computer, your email,and even your instant messages. It also includes updates that can be obtained from Symantec's "Live Update" center. Like all programs that detect computer threats, it's only as good as its last update. That's why it's key that you keep the virus definitions up-to-date at all times. Norton...