Find the proper drive that is assigned to the location where the installation medium is stored, and select it as the boot media to load. A list of available media options that can be loaded is displayed including any hard drives, optical drives, or other media that are accessible on the computer. Press the Spacebar on the keyboard at the beginning of the boot process to load into the boot options. Try restarting the computer again, but access the boot options this time. The installation medium is usually a CD/DVD and must therefore be booted from the CD/DVD drive.If the installation medium is not read right after the computer is restarted and the Windows PE (Pre-installation Environment) is loaded, but the user is taken to the same ‘BOOTMGR is missing’ error, then the computer must boot the appropriate medium to load the WinRE. Once in the drive, boot the medium, not the hard disk. This is done by the following process:Ensure that the Windows OS installation medium for the OS that is currently installed on the system is in the drive. The BOOTMGR problem can be repaired via the OS installation medium. It simply makes the computer reboot and go through the boot sequence until it meets the BOOTMGR requirements that caused the same error. The problem with the simple instructions to restart the computer with Ctrl+Alt+Delete is that it will not fix the problem. ![]() The message displayed is “BOOTMGR is missing, Ctrl+Alt+Delete to restart” along with a blinking cursor. When this occurs an error from the Boot Manager appears during the machine’s startup sequence. ![]() This process is essentially the operating system boot loader that loads the operating system kernel and device drivers that are in the boot-class.Small changes can easily corrupt the BOOTMGR configuration on Vista, Server 2008, and Windows 7. ![]() BOOTMGR runs the “winload.exe” process in order to do this. It finalizes the steps in booting the computer and loading the Operating System by looking for the active partition in which Boot Configuration Data is stored. The BOOTMGR (Windows Boot Manager) is part of Microsoft Windows Vista, Windows Server 2008, and Windows 7.
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