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How to Fix “error loading operating system”?


"Error loading operating system" error shows when your computer’s BIOS doesn’t support the capacity of the hard disk where you are installing Windows 10 or it hasn’t been installed properly. This article will tell you how to work around Error Loading Operating System when starting up Windows 10.

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My windows 10 it crashed yesterday. When I restarted it after loading the logo a message appeared saying that "error loading operating system". So I restarted it again, but it is showing the same message. Cannot even open boot menu.

“Error loading operating system” with a black screen is an irritating problem often witnessed by users when they try to boot their Windows PC. The start-up issue generally occurs after the fresh installation of the Windows operating system, however, sudden power failure, system crash, or system restart, which also makes the PC to throw the error message.

Why does the computer encounter Error Loading Operating System Problem?

Here are possible reasons why your computer gets such error problems for you:
1). Computer hard disk failures
The most reason of computer error loading operating system issues can often be caused by computer hard disk failures. Why? When people are trying to boot the desired PC, the computer often need to read the operating system information stored on the plugged computer hard disk Until the system is booted at last. However, when the hard disk is damaged somehow or the sections that hold much important operating system data are filled with bad sectors or physically corrupted, the computer cannot recognize the desired operating system information and make the computer operating system load unsuccessfully.
2). Computer hard disk MBR information is not right
Once the hard disk MBR information becomes incorrect, The common computer operating system loading during booting also is able to be negatively affectedly or stopped.
3). Computer operating system gets problems
Some damaged boot files or configuration files of your computer OS, also can lead to computer error loading operating system problems.
4). Set PC hard disks incorrectly when there are multiple hard disks used on the same computer
5). Computer hard disk is not properly partitioned or the operation system partition is damaged
The improperly partitioned hard disk also will affect the PC operating system loading in daily use. And the hard drive’s partition may become damaged because of disk write errors, power outages or virus attacks. If that’s the case, the operating system cannot access the system files to boot properly and the loading process is halted.

How to Fix Error Loading Operating System Issue?

Solution 1: Properly Setup BIOS and CMOS

Press DEL/ F1 /F2 /ESC keys to enter BIOS/CMOS Setup. Set the hard disk with the operating system as the first boot hard disk. If necessary, please update your motherboard's BIOS by referring to the computer's manual or visiting the manufacturer's website.

Solution 2: Update your system BIOS to the latest version

Take extra care while updating the BIOS version. This is because during the process due to sudden power loss, the BIOS firmware may get corrupt. Consequently, you might not be able to access your data. Thus, always follow the best practice to back up all your important files before performing the BIOS update, so you can access and work on them later.
Follow the below steps to update your computer BIOS:
1.      Find the model of your motherboard. Check this out in the user manual of your mainboard.
2.      Identify the current BIOS version – For this, open the System Information app. In the search box type ‘System Information’ and select ‘System Summary’. The BIOS version will be displayed.
3.      Download the latest BIOS update – Visit the motherboard or laptop manufacturer’s website. Search for the model of your system and from the list of available downloads go for the BIOS update.
4.      Once downloaded, run the BIOS update.
5.      Restart the Computer after the BIOS update.

Solution 3: Recreate the partitions

The “Error loading operating system” error is more likely to appear if your partitions were also changed by another system before installing windows, e.g. a Linux distribution.
When you reinstall Windows 10, make sure you delete all partitions and create the partitions you need to install it.

Solution 4: Restore the MBR information of hard disk with bootrec.exe

bootrec.exe is a tool built in the Windows Recovery Environment (Windows RE) that you can use to troubleshoot and repair the error. The steps for accessing bootrec.exe to rebuild the master boot sector:
1.      Insert your Windows 7 install disc
2.      Restart your computer and boot from the CD
3.      Press any key at the “Press any key to boot from CD or DVD” message
4.      Choose Repair your computer after you select the language, time and keyboard method
5.      Select your Windows installation drive (usually C:\)
6.      Click Next
7.      Select Command Prompt from System Recovery Options
8.      Type the following command and press Enter:
bootrec /FixMbr
bootrec /FixBoot
bootrec /ScanOs
bootrec /rebuildBcd
9.      Type Exit. Press Enter and emove the CD/DVD,
10.     Restart your computer

Solution 5: Reinstall your Windows operating system

When the above solutions do not solve the issue, the computer shows ‘error loading operating system’. And the hard drive is also working with no Physical Issues, then the best way is reinstall the Windows operating system. Reinstalling Windows gives you back a speedily working computer.

Why recover lost files and folders from hard disk?

While fixing the ‘error loading operating system’ issue, you might lose important data from your computer’s hard disk. If you have not backup of your data, you need a powerful data recovery software is the only way to get back your lost files and folders. One of the widely used software is Bitwar Data Recovery which is a fast, reliable and free data recovery software with powerful functions. It can Recover lost or deleted files, photos, audio, music from any storage device effectively, safely and completely. The software is the best solution for data loss on your hard drive. This tool compatible with FAT 16, FAT 32, NTFS, NTFS 5, ExFAT, HFS+ and HFSX file systems.

Install Bitwar Data Recovery

Download the software now and install it on your computer, if the system still does not boot, you can remove the drive from your computer and connect it to another computer to recover.

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Steps to recover lost files and folder

Step 1. Select your partition where your important files and folder lost, then click “Next”.

Step 2. Select the “Quick Scan” or “formatted recovery” mode first due to the reason of data loss, If files are not override by new data, files can be fully recovered. However, If files are not found under the previous scan, try “Deep Scan”. The deep scan can find all the files with a detailed scanning algorithm, but will not display the file names and may take longer time.
Step 3. Choose the exact types of files you want to recover, you can select all types if you have no idea about what type of files you want to recover.

Step 4. After scan, find the files you want and then preview them by double-clicking one by one. When determined, choose the data you want and click "Recover" button to restore them back. Here, you'd better save all the recovered files to a external device or other disk in case of data recovery failure.



The computer hard disk is often used to save very important or valuable files. Before doing any drive check, reinstalling computer operating system or restoring the PC to factory setting, please back up useful data well at first, to avoid data loss due to operational errors. No matter what happens to your computer, please remember you can recover them with Bitwar Data Recovery. If data loss during the resolution, do not hesitate to recover directly with it to recover the data quickly.

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Keywords:error loading operating system