Solutions for Windows Boot Manager Windows Failed to Start

4. A required device is inaccessible. A recent hardware or software change might be the cause.

How to fix "Windows boot manager Windows failed to start"?

Method 1: Remove newly installed hardware or external devices and reboot

Remove newly installed hardware or external devices and reboot to see if the problem has been solved.

Method 2: Perform automatic repair

1. To access the BIOS settings, go into the BIOS by pressing the designated key (usually F2, F12, or Del) and change the boot device to the CD/DVD drive. Save the changes by pressing F10, then exit the BIOS. Once the computer boots up, follow the on-screen instructions to set the language, time, and currency format, and click "Next" to proceed.

2. Click "Repair your computer" from the lower left corner.

3. Click "Startup Repair" in the "Choose a recovery tool" screen, which will automatically run automatic repair if there's a system issue, or prompt a restart if the system is fine.

4. Follow the instructions on-screen to complete the Automatic Repair.

Method 3: Perform a system restore

1. Boot from the Windows installation disk.

2. In the Windows Setup interface, you can set language and other preferences and then click Next.

3. Click the button: "Repair your computer".

4. Click "System restore" in the "System Recovery tool" screen.

5. Confirm your restore point and click "Finish" to perform this operation.

6. To restore the computer to an earlier state when it was working fine, follow the on-screen instructions. This process will revert the computer's settings and programs to a previous point in time, effectively undoing any changes or issues that may have caused problems.

Method 4: Rebuild BCD configuration

1. To boot from a Windows installation disc, press any key when the "Press any key to boot from CD" message appears on your screen.

2. To proceed, simply enter your preferred language and other settings, then click the "Next" button. This will guide you through the installation process.

3. Select the Windows operating system you want to repair, and then select "Next".

4. Click "Command Prompt" on "System Recovery Options" page.

5. Input the following commands in the Command Prompt window and press Enter after each one.

• bootrec.exe /fixmbr
• bootrec.exe /fixboot
• bootrec.exe /rebuildbcd

How to prevent data loss

Despite trying various methods to fix a Windows boot manager failure, sometimes a computer may not return to normal. In such cases, reinstallation is the only option, which can result in the loss of important data. To avoid this, it's essential to back up important files and system data with a third-party software in advance.

Qiling Disk Master Standard is a free and trustworthy backup software that I recommend. It allows you to back up files, systems, disks, and more, and can be used to restore these images whenever needed. Compatible with Windows 11/8.1/8/7/Visa/XP, this software provides a reliable solution for easily restoring files or systems in case of issues on your computer.

• Free Download
• Windows 11/10/8.1/8/7, 100% Secure

If you want to enjoy more advanced functions, you can upgrade to Qiling Disk Master Professional.

Now, learn the stepsto dobackupfiles and foldersand restoreit.

Download Qiling Disk Master Standard, install and launch it, then perform a backup by selecting "Backup" and "File Backup" in the left tab page, and follow the prompts to complete the file backup operation.

Start to restore. Click the "Restore" and "Select Task" option, select the backup image you want to restore, and follow the prompts to complete the restore operation.

Note: If you can't boot into Windows to run the program for the restore, you can create a bootable media with Qiling Disk Master in advance, and then boot from that media.

Conlusion

If you're experiencing issues with your Windows boot manager, creating a backup is essential to prevent data loss. With a backup in hand, you can restore your computer to a good state even if you encounter problems like the Windows boot manager failing to start. Qiling Disk Master offers different versions to cater to various users, including Qiling Disk Master Server for Windows Server users. This ensures that you have a reliable solution to create backups and restore your system, saving you from the hassle of reinstalling your computer.

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