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Virus Definition A computer virus is, simply, a program designed to attach itself to another computer program. Some computer viruses damage the data on your disks by corrupting programs, deleting files, or even reformatting your entire hard disk. Most viruses, however, are not designed to do any serious damage; they simply replicate or display messages. Most viruses stay active in memory until you turn off your computer. When you turn off the computer you remove …

…Norton AntiVirus does automatically: Checks system files and boot records for viruses at system startup. Checks programs for viruses at the time you use them. Scans your startup drive for viruses once per week. Monitors your computer for any activity that might indicate the work of a virus in action. Scan files you download from the Internet. Checks floppy disks for boot viruses when you use them. Updates your virus protection at least once monthly.