How to fix Windows 10, 8, 8.1 MBR without installation disk

Andrew Wafer By: Andrew Wafer
3 minute read
fix Windows 10 MBR

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Are you having issues in booting your Windows 10 / Windows 8.1, 8 device? If you are experiencing various boot errors or even if you are stuck in a boot loop, then you definitely have to fix your Windows 10, 8 MBR (Master Boot Record). In that matter, don’t hesitate and check out the guidelines from below.

bootmgr
Fixing the Windows 10, or Windows 8.1, 8 MBR can be quite easy especially if you can use the Windows 10, 8 installation DVD. You just need to follow the troubleshooting process and to run some commands in Command Prompt (bootrec /RebuildBcd; bootrec /fixMbr; bootrec /fixboot; Exit).

But what can you do if you can’t use the Windows 10, 8 disk? In that case, the process is a little bit tricky as you need to be fast when completing the troubleshooting steps. You will see what I am talking about at the right time in the steps from below which will be detailed in a minute.

The Windows 10, Windows 8.1, 8 MBR might get corrupted or you might experience MBR related issues if your device was infected with malware, or if an improper shutdown has occurred. So, as you might know, it’s more than recommended to protect your device by using dedicated antivirus and antimalware tools and you should always be careful when shutting down your Windows computer.

Anyway, since the MBR has been already bricked, let’s see how to fix it without using the Windows 10, 8 DVD.

How to fix Windows 10,8 MBR without installation disk

  1. Use Windows Troubleshoot
  2. Run Bootrec
  3. Disconnect USB portable drive

1. Use Windows Troubleshoot

  1. Restart your Windows 10, 8 device.
  2. Just before the Blue Window appearance you need to press “Ctrl + Alt + Del” (you might need some practice before being able to do this properly).windows-8

  3. For various PC problems, we recommend this tool.

    This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

    1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
    2. Click “Start Scan” to find Windows issues that could be causing PC problems.
    3. Click “Repair All” to fix all issues with Patented Technologies (requires upgrade).

  4. Your device will restart automatically.
  5. Just as mentioned above, before the Blue Window press “Ctrl + Alt + Del” once more.
  6. Now, the computer will reboot again – this time let the machine restart without doing anything else.
  7. On your Windows 10, 8 device the “Preparing automatic repair”, “Diagnose” and “Attempting Repairs” alerts should be displayed.
  8. After that, from your device select “Advanced options”.
  9. Up next, go towards “Troubleshoot”.
  10. Once more, select “Advanced options”.
  11. And finally pick “Windows startup settings” and choose “Restart”.
  12. That’s it, now your computer should restart normally.

2. Run Bootrec

  1. Follow the steps listed above until step number 9
  2. When the Advanced options screen appears, select Command Prompt
  3. Enter the following commands and hit Enter after each one:

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

3.  Disconnect USB portable drive

If there is an external USB portable drive connected to your Windows PC, this may explain why you can’t boot your device. Many users who encountered this issue confirmed that unplugging the drive solved the problem.

So, that’s how you can fix Windows 10 or Windows 8.1, 8 MBR without using your installation disk or DVD.

If you have questions or if you can’t apply the steps above, share your thoughts with us by using the comments field from below and we will help you as soon as possible.

Also, if you’ve got additional tips and suggestions on how to fix Windows 10 MBR without installation disk, you can list them in the comments below.


Editor’s Note: This post was originally published in May 2014 and has been since completely revamped and updated for freshness, accuracy, and comprehensiveness.


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For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patented Technologies (requires upgrade).

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