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BOOTMGR (Windows Boot Manager) is a small program that loads the operating system for you. When you start your computer, the BIOS (Basic Input/Output System) or UEFI (Unified Extensible Firmware Interface) firmware initializes the hardware and then hands over control to the BOOTMGR. BOOTMGR then displays a list of installed operating systems (if multiple are present) and boots the selected one. windows 7 bootmgr download