Script viruses (sometimes called macro viruses)  generally travel embedded in  email  and office automation documents, although they can be found in  web pages  as well.   Old fashioned  program viruses  are usually implemented in executable system code, whereas script viruses are usually written in a powerful high-level language that is compiled and run on the fly. They often have sophisticated functionality and direct interfaces to high level applications such as word processing, spreadsheet, email, and  web  programs, and can wreak considerable havoc. Since they first surfaced in office automation programs, they are sometimes also called "macro" viruses. Script viruses can also propagate through  IRC  protocols.   On Microsoft computers, turning on your script checking  virus protection  is essential. However, keep in mind that there may be an associated performance hit for some applications. Many applications on Windows...
 
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