How to Fix “BOOTMGR is Missing” Error in Windows

Last update: 07/02/2025
Author Isaac
  • BOOTMGR missing is usually caused by files or configurations of Boot damaged.
  • Checking cables, external devices, and boot order can resolve basic issues.
  • Tools like bootrec or Startup Repair are essential to repair the boot.
  • In severe cases, third-party software or even reinstalling may be necessary. Windows.

UEFI BIOS

If you have ever turned on your computer and encountered the message «BOOTMGR is missing. Press Ctrl+Alt+Del to reboot», you know how frustrating it can be. This problem is more common than it seems and can be due to various causes such as corrupted boot files, Faulty MBR or HDD that does not respond adequately.

This error may seem insurmountable at first, but in reality, there are multiple methods to fix it. Below, we will break down all the possible solutions in the most detailed and clear way possible, so that you can get your computer up and running again.

What does the error “BOOTMGR is missing” mean and why does it appear?

BOOTMGR missing

The term BootMgr refers to Boot Manager Windows, a small program essential for starting the operating system. This file is usually located in the active partition from your hard drive. When BOOTMGR is missing or corrupted, the system cannot find the instructions needed to start Windows, resulting in the well-known error.

The most common reasons why this message appears include:

  • Incorrect shutdowns or power outages that corrupt boot files.
  • Hard drive errors, such as bad sectors.
  • Problems in configuration from the BIOS or UEFI.
  • Failed installation attempts or Windows update.
  • Boot Configuration Files misconfigured or corrupted.

First steps to solve the error

Before moving on to more complex solutions, it is important to perform some Basic checks:

  1. Restart the computer: Sometimes simply restarting the system can resolve the issue if it is a one-time thing.
  2. Remove the devices from storage external: Make sure there are no disks USB, DVDs, or external hard drives connected, as the system may be attempting to boot from them instead of your primary hard drive.
  3. Check the cables: Turn off the equipment, disconnect it from the power and check that all cables are connected. SATA and eating are firmly connected. If any are loose or damaged, replace them.
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Correctly configure the BIOS

Your computer may be trying to boot from the wrong device. To fix this:

  1. Restart your computer and enter the BIOS by pressing the key indicated on the boot screen (usually F2, F10, Esc o Delete).
  2. Look for the settings tab of the boot order (Boot Order).
  3. Make sure the hard drive containing your operating system is set as the first boot option.
  4. Save the changes and restart the computer.

Repair MBR and boot files

The master boot record (MBR) is key to starting Windows. If it is damaged, it can prevent the operating system from loading. Follow these steps:

  1. Insert a windows installation disk or a unit Bootable USB with the operating system.
  2. Boot from the installation media by selecting it in the BIOS.
  3. Once loaded, select your language and click Repair equipment.
  4. Access to Advanced and select Symbol of the system.
  5. Write the following commands one by one, pressing Enter after each one:
bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd

Reboot your system to check if the problem is resolved.

Use Startup Repair

Windows includes an automatic tool called Startup repair which can fix problems related to files required for boot.

  1. Boot from the Windows installation disc or a bootable USB.
  2. Choose Repair equipment.
  3. Access to Advanced and choose Startup repair.
  4. Follow the on-screen instructions and restart your computer.

Reconstruction of the BCD

The BCD (Boot Configuration Data) is a file that contains all the data needed for the operating system to boot. If it is corrupted, you will not be able to start Windows:

  1. Open the Symbol of the system from the installation disk.
  2. Write the command: bootrec / RebuildBcd.
  3. Follow the on-screen instructions and reboot your system.

Use third-party tools

There are programs like MiniTool Partition Wizard o EASEUS Partition Master which include advanced boot repair options. These offer graphical interfaces more intuitive and do not require complicated commands.

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Closing remarks

In some cases, if the above methods do not work, you may need to replace the HDD if you are physically damaged or perform a clean installation of windows. Before this, make sure to perform a Backup of your important data.

Resolve the error "BOOTMGR missing" It can be a tedious process, but with the right methods and a little patience, it is possible to return your computer to normal without any major complications.