High Quality Content by WIKIPEDIA articles! Disinfectant was a popular anti-virus software program for the classic Macintosh operating system. It was originally released as freeware by John Norstad in 1988. New releases continued until the author retired the program in 1998, citing the new danger posed by macro viruses, which Disinfectant did not detect, and the inability of a single individual to possibly maintain a program that caught all of them. 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. A variety of strategies are typically employed. Signature-based detection involves searching for known malicious patterns in executable code. However, it is possible for a user to be infected with new malware for which no signature exists yet.

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