There are a half-dozen popular varieties, with the two most-popular being Symantec’s Norton AntiVirus (NAV) and McAfee’s VirusScan. These will each run you between $30 and $80 depending on where you buy it and how long a subscription you purchase.
Alternatives exist, however, which should be considered before settling on one of the big brand names.
Do I have to run an antivirus program?
No. Antivirus programs can not protect you from every virus. In fact, an antivirus program can not help you out anymore than following the first four rules I’ve already mentioned. If a new virus is going to infect you, it’s going to infect you regardless of whether or not you are running an antivirus program. And like I pointed out above, it’s entirely possible that the antivirus itself could open you up to infection.