How to Fix MBR on Windows 10, 8, 7?

The MBR (Master boot record) is a boot sector (region of your hard disk) that holds data about the partitions of your hard drive and if the MBR is harmed, you won’t be able to boot into Windows. In this article, we will discuss how to fix MBR related problems.

All Windows variants – Windows XP, Vista, 7 or 8 – use MBR and, if harm you won’t be able to boot. It can be harmed by certain viruses that target the MBR to replace it with their own code or in cases when you dual boot with a Linux distribution. The MBR is a special type of boot sector found at the beginning of your system partition. The MBR informs the boot process as to what is about to follow, such as partition layouts, sizes, file systems, etc. An MBR also contains a small piece of executable code that passes the boot process to the operating system proper, landing you within Windows.

Sadly, the MBR isn’t infallible. It can become invalid, damaged, or simply disappear, for several causes. This makes Windows 10 prone to errors. Luckily, there are several ways to set the master boot record in Windows 10

What Are MBR Errors?

MBR errors raise when your Master boot record fails to work the way it is expected to. They often crop up due to malware attacks or improper power-offs.

Here are the most common of those:

  1. ‘Error loading operating system’
  2. ‘Operating System not found’
  3. ‘Invalid partition table’
  4. ‘No bootable medium found’
  5. ‘Restart and choose proper boot device or insert boot media in selected boot device and click a key’

There is a chance your system will fail to boot into Windows. Instead, you will meet a screen with an error message stating “Missing operating system,” “MBR error,” “Error loading operating system,” “Invalid partition table,” or similar

How Are MBR Errors Caused?

A master boot record corruption can occur for a number of causes. Drive failure and damage is a very common cause. In recent years, certain Ransom variants attacked master boot record to force victims into paying to secure their PC. Fortunately, this ransomware practice is very rare, though numerous other malware examples directly change the MBR for maximum harm and irritation.

How To Fix MBR on Windows 10, 8 and 7

There are some fixes can be helpful in fixing MBR on Windows 10, 8, 7. Here we go:-

1. Fix MBR Using Command Prompt without CD

mostly, you will see Windows Boot Options index after your system restarts a lot of times. If not you require the original Windows 10 installation DVD to fix the Master boot record. Boot from the original installation DVD. At the Welcome screen, press Repair your computer. Then, you can go through the steps below to open command Prompt to fix MBR in Windows 10 operating system.

1. Select “Troubleshoot > Advanced Options > Command Prompt”.

2. When Command Prompt displays on your screen, enter the following lines and hit Enter after each line:

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

In some cases, you may require to run some extra commands.

bootsect /nt60 SYS or bootsect /nt60 ALL

3. Hit Enter after each command and wait for each operation to complete. Exit and now go ahead and restart your PC.

2. Back-Up Data Without OS

Since you are not able to boot into Windows 10/8/7, you would better backup your data without booting into your system. It’s wise to back up MBR or create a system recovery disk so that in case something mishappening you don’t have to run for the Windows Recovery Disk. After the backup, you can not only make sure that your data and system are safe, but also repair your MBR disk without any risk.

3. Fix MBR on Windows 10 Via Command Prompt

Step 1: Create a Windows 10 installation disk.

Note: Connect the USB to target PC. Alter the boot order in BIOS setup and put “Removable Devices as the first boot choice. Then boot the System from USB disk.

Step 2: After entering the Windows recovery environment, please select “Troubleshoot”> “Advanced Options”> “Command Prompt”.
Step 3: In the command prompt, type bootrec /fixmbr,  bootrec /fixboot,  bootrec /rebuildbcd. Press “Enter” after you type each command. Please reboot the PC once the repair process finishes.
Tips: If you have installed dual systems or more, you will need to additionally type in: bootrec /scanos. It will add all systems to boot configuration data.

What To Do After Repairing Your MBR?

The unfortunate thing is, MBR issues often come with data loss, which means you might need to recover your valuable files. You can’t do that manually, so to win them back, you should use special software. For example, Auslogics File Recovery can bring back your valuable data and spare you much tearing of hair. Besides, you should bear in mind that your MBR is actually targeted by certain viruses: they strive to interfere with it so that you cannot boot into your Win 10 anymore. To prevent your Master boot record from damage, you should keep malware out.

Here are some tips that can help you out with this task:

Make Use Of Windows Defender

Windows Defender is built-in software that comes as part of your Win 10 and acts as your main security solution if you do not have a third-party antivirus installed.

You can employ Windows Defender to scan your OS for malicious items and banish them from your computer:

Settings -> Update & Security -> Windows Defender -> Open Windows Defender -> Full

Use a Third-Party Antivirus

If you want to use a non-Microsoft solution to protect your PC against malware attacks, you should find a product that is trustworthy, powerful and capable of dealing with the latest threats

Malware has never been more aggressive than today – that is why you need as much anti-malware protection as possible. Choose a flexible and intuitive anti-malware tool that will force malicious intruders to give your computer a wide berth.


These were methods and some tricks guiding you on how to deal with MBR errors. These methods will surely help you to Fix MBR on Windows 10, 8 and 7.

If you feel any difficulty in implementing the above-given methods, please feel free to let us know in the comments. We will surely help you.

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