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Difficulty: MediumTroubleshooting Windows OS Startup and Boot Errors

A system administrator is troubleshooting a desktop computer running Windows 10 configured in UEFI mode that fails to boot, presenting a screen indicating that the operating system configuration could not be found. After booting into the Windows Recovery Environment (WinRE) command prompt, the administrator needs to identify any existing Windows installations not listed in the current boot configuration and rebuild the BCD database. Which TWO actions should the administrator perform from the WinRE command prompt to resolve this issue? (Select TWO.)

  1. Execute bootrec /scanos to search all connected disks for Windows installations compatible with the current OS setup.Answer
  2. Execute bootrec /rebuildbcd to scan all disks for Windows installations and prompt the technician to add them to the BCD store.Answer
  3. C
    Execute bootrec /fixmbr to overwrite the Master Boot Record and restore the partition table on the system drive.
  4. D
    Execute sfc /scannow to recreate the missing Boot Configuration Data file from the Windows Component Store.

Answer

Executing bootrec /scanos identifies installed Windows systems not listed in the BCD, and running bootrec /rebuildbcd allows the technician to add those identified installations back into the BCD store.
To repair a boot failure caused by missing or corrupted boot entries in Windows, the bootrec tool provides two primary options: /scanos searches all connected disks for installed Windows operating systems that are not currently included in the Boot Configuration Data (BCD), while /rebuildbcd performs a scan and interactively prompts the administrator to add any discovered installations directly into the BCD store.

Step-by-Step Solution

1
Boot into the Windows Recovery Environment (WinRE) and open the Command Prompt.
Access to administrative command-line repair tools is established.
WinRE provides offline access to boot repair utilities such as bootrec.
2
Run the command bootrec /scanos.
Disks are scanned for Windows installations currently unlisted in the BCD store.
This confirms whether the OS partition is recognized and readable by the recovery utility.
3
Run the command bootrec /rebuildbcd.
Disks are scanned and the technician is prompted to import discovered Windows installations into the BCD.
Rebuilding the BCD store restores missing boot entries necessary for Windows to start.

Key Concept

Windows Boot Configuration Data (BCD) Recovery using Bootrec tools
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Topics

Troubleshooting Windows OS Startup and Boot Errors

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