A computer virus is a potentially damaging computer program designed to affect or infect a computer negatively by altering the way it works. A virus spreads when users share the host program to which the virus is attached. A virus can replace the boot program with an infected version (boot sector virus), attach itself to a file (file virus), hide within a legitimate program (Trojan horse virus), or use an application’s macro language to hide virus code (macro virus). The virus is activated when a certain action takes place (a logic bomb) or at a specific time (a time bomb). Viruses can be prevented by installing an antivirus program, write-protecting a rescue disk or emergency disk, never starting a computer with a disk in drive A, scanning floppy disks for viruses, checking downloaded programs, and regularly backing up files. Inoculate the sick computer above by placing your mouse pointer over the inoculate link.

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