B

Backing up - Creating a backup copy of a file in the BACKUP folder before treating it (disinfection or deleting). This file can later be restored from the backup copy, for example, for subsequent scanning with the current version of the anti-virus database.
BACKUP - A directory that contains backup copies of deleted and disinfected objects.
Boot sector - A special disk area that contains the operating system loader program.
Boot virus - A virus infecting boot sectors of your disks and of the operating system installed in your computer. During a system boot, the virus forces the system to read it into memory and to surrender control from the original loader code to the viral code.