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Difficulty: MediumTroubleshooting Windows OS Startup and Boot Errors

An IT support technician is troubleshooting a desktop computer running Windows 10 that fails to start after an improper system shutdown. Immediately following the Power-On Self-Test (POST), the system displays a black screen with the message 'BOOTMGR is missing'. The technician boots the system into the Windows Recovery Environment (WinRE) Command Prompt and verifies that the boot loader file has been deleted from the active system partition. Which of the following commands should the technician execute to copy the missing boot environment files from the Windows system directory back to the active partition?

  1. bcdboot C:\Windows /s C:Answer
  2. B
    bootrec /fixmbr
  3. C
    sfc /scannow /offbootdir=C:\ /offwindir=C:\Windows
  4. D
    bcdedit /import C:\Backup\BCD

Answer

The command 'bcdboot C:\Windows /s C:' correctly repairs the startup issue by copying essential boot files, including BOOTMGR and a fresh Boot Configuration Data (BCD) structure, from the operating system directory onto the designated system volume.
The `bcdboot` command is specifically designed to quickly setup a boot partition or repair the boot environment. Running `bcdboot C:\Windows /s C:` copies the required system boot files—including BOOTMGR and the BCD store—from the Windows installation directory to the specified system volume.

Step-by-Step Solution

1
Identify the cause of the boot failure.
The error 'BOOTMGR is missing' indicates that the primary boot loader binary is missing from the active boot volume.
Resolving this error requires placing a valid copy of the boot manager file back into the root of the active partition.
2
Select the appropriate utility to deploy boot environment files.
The BCDBoot command-line tool (`bcdboot`) is designed to copy system boot files from the Windows directory (`C:\Windows`) to the system partition (`/s C:`).
BCDBoot initializes the Boot Configuration Data store and copies BOOTMGR without needing a full OS reinstallation.
3
Execute the recovery command in WinRE Command Prompt.
Running `bcdboot C:\Windows /s C:` generates new boot files and replaces missing boot loader binaries.
This establishes the necessary boot environment for the computer to start normally.

Key Concept

Windows Boot Environment File Repair via BCDBoot
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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