Malicious programs come in a variety of different types. Viruses spread from computer to computer by infecting other programs. Worms spread by exploiting capabilities of the network. Trojans pretend to be useful and valuable programs…until they turn and do something nasty. Adware's pop-up ads interfere with your work. Spyware can steal personal information while keyloggers steal everything you type, and more. Rootkits subvert the operating system to hide their activities. Scareware pretends to be security software but at best does no good. Which of these should your antivirus remove? Simple, all of them! Viruses make up only a small part of threats "in the wild," but the term antivirus has come to define protection against all types of "malware"-a term that hasn't gotten much traction outside the security industry. When most people talk about antivirus software, what they really mean is anti-malware software. Check out these free programs! But remember, the best way to stay free of all of these malicious programs, is to update your malware protection.