A Windows 10 workstation fails to start and instead displays the message "BOOTMGR is missing." The technician has booted the PC to the Windows Recovery Environment (WinRE) Command Prompt. Which command should the technician run first to repair the Master Boot Record (MBR) and attempt to restore the system's ability to boot?
The command bootrec /fixmbr rewrites a clean Master Boot Record on the system partition without altering existing partition tables. This is the recommended first step when the MBR is damaged or overwritten, causing errors such as "BOOTMGR is missing." Running System File Checker (sfc /scannow) or DISM commands requires Windows to boot, chkdsk /r checks disk integrity but does not repair the MBR, and diskpart clean would wipe the drive entirely, making recovery impossible. [Microsoft Support article "Use Bootrec.exe in the Windows RE to troubleshoot startup issues"]
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