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Brain was launched today in 1986. What was it?

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Answer:

Brain was the first PC virus. Brain targeted MS-DOS and, according to the BBC, "Brain was known as a "boot-sector" virus because of the area on a floppy disk it hid on. By concealing itself in this region, the virus could ensure that it would be installed every time that floppy disk was used on another computer. The Brain virus is now extinct." Good histories of Brain and other viruses are available from the BBC and Symantec