Bootloader malfunction Windows 10 is a problem that every user of this operating system can face. Despite the variety of causes for problems, it is not at all difficult to restore the bootloader. Let's try to figure out how to return access to Windows and prevent the malfunction from occurring again.
- Reasons for bootloader problems Windows 10
- How to restore bootloader Windows 10
- Repair bootloader automatically
- Video: Boot Loader Repair Windows 10
- Repair bootloader manually
- Using the bcdboot utility
- Video: Step by Step Boot Loader Repair Windows 10
- Formatting a hidden volume
- Video: a way to restore the bootloader for advanced users
Reasons for bootloader problems Windows 10
Before proceeding with the recovery of the operating system bootloader Windows 10, it is worth identifying the cause of the malfunction. After all, it is possible that the problem will appear again, and soon.
- The most common cause of a bootloader problem is the installation of a second OS. If this was done incorrectly, the boot instructions Windows 10 could be violated. Roughly speaking, B IOS does not understand which OS to load first. As a result, none are loaded.
- The user could accidentally format or use a part of the hard disk reserved by the system. To access such a segment, additional software or specialized knowledge is required. Therefore, if you do not understand what is at stake, this is hardly the reason.
- The bootloader Windows 10 may have stopped working correctly after another system update or internal failure.
- Virus or third-party software could also cause the bootloader to malfunction.
- Computer hardware problems can result in loss of system data. This causes the bootloader to stop working because the necessary files are lost.
It is often easy to restore the bootloader Windows 10. Moreover, the procedure is the same.
Hard disk problems – a possible cause of bootloader problems
The most serious problem is the last item on the list. Here we are often talking about a technical malfunction of the hard drive. The point is that it wears out. This leads to the appearance of bad blocks – “bad” disk segments, data from which it is physically impossible to read. If one of these segments contained files required for loading Windows, the system, of course, will not be able to boot.
In this case, a reasonable decision would be to contact a specialist. It can partially recover data from bad blocks and even fix a hard drive for a while, but soon it will still have to be replaced.
In any case, it will be possible to diagnose the described problems only after restoring the bootloader. Therefore, let's go directly to solving this problem.
How to restore bootloader Windows 10
Regardless of PC / laptop model, version B IOS or file system, there are two methods to fix the bootloader Windows 10: automatic and manual. Moreover, in both cases, you will need a bootable or USB disk with the corresponding operating system on it. Before proceeding with any of the methods, make sure that no other flash drives are inserted into the USB connectors, and that the drive is empty.
Repair bootloader automatically
Despite the rather skeptical attitude of power users towards automatic utilities, the bootloader repair tool from Microsoft has worked well. In most cases, it can be used to quickly and easily solve the problem.
- If you do not have a bootable disk / flash drive, you need to create them on another computer.
- Login to B IOS and configure booting from the appropriate media.
- In the window that appears, click on the 'System Restore' button (below).
Click on 'System Restore' to open the recovery menu
- In the menu that opens, click on 'Troubleshooting' and then on 'Startup Repair'. After selecting the OS, automatic recovery will begin.
Go to 'Troubleshooting' to further customize recovery
After the recovery process, the PC will reboot if everything went well. Otherwise, a message will appear stating that the system could not be restored. Then move on to the next method.
Video: Boot Loader Repair Windows 10
Repair bootloader manually
To manually restore the bootloader program, you will also need a disk / flash drive with Windows 10. Let's look at two methods that involve using the command line. If you have not used it before, be especially careful and enter only the commands below. Other actions may result in data loss.
Using the bcdboot utility
- Install boot from USB / floppy drive. To do this, in menu B IOS go to the Boot section and put the desired media in the first place in the list of boot devices.
- In the window for selecting language settings, press the Shift + F10 key combination. This will open a command prompt.
- In a row, enter the system commands (without quotes), pressing the Enter button after each: diskpart, list volume, exit.
After entering the diskpart command loop, a list of volumes appears
- A list of volumes will appear. Remember the letter of the volume name where the system is installed.
- Enter the command 'bcdboot c: \ windows' without quotes. Here c is the letter of the volume with the OS.
- A message appears prompting you to create download instructions.
Try turning off and on your computer (don't forget to disable booting from USB / disk to B IOS). The system may not boot immediately, but only after a second reboot.
If error 0xc0000001 appears, you need to restart your computer again.
Video: Step by Step Boot Loader Repair Windows 10
Formatting a hidden volume
- Repeat steps 1 and 2 of the first method.
- Enter the command diskpart, then list volume.
- Browse the list of volumes. If your system is configured according to the GPT standard, you will find a hidden volume without a letter with a FAT32 file system (FS), ranging from 99 to 300 MB. If the MBR standard is used, there will be a volume with NTFS up to 500 MB.
- In both cases, remember the number of this volume (for example, in the screenshot it is 'Volume 2').
Remember the hidden volume number in the 'Volume###' column
Now remember the letter of the name of the volume where the system is installed (as you did in the first method). Consecutively enter the following commands without quotes:
select volume N (where N is the number of the hidden volume);
format fs = fat32 or format fs = ntfs (depending on the filesystem of the hidden volume);
assign letter = Z;
bcdboot C: \ Windows / s Z: / f ALL (here C is the letter of the volume on which the system is installed, and Z is the letter of the hidden volume assigned earlier);
select volume N (where N is the number of the hidden volume assigned the letter Z);
remove letter = Z;
Restart your computer. If this method did not help you either, contact a specialist. If there is no important information on the system disk, you can simply reinstall Windows.
Video: a way to restore the bootloader for advanced users
Whatever the cause of the bootloader malfunction Windows 10, these methods should fix it. Otherwise reinstalling Windows will help. If even after that the computer runs slowly or there is a problem with the bootloader again, then its part is faulty (usually the hard disk).