Hello everybody!
This video is about recovering Windows 10, 8 and 7 bootloader.
Very often users face the problem when the operating system will not boot, and in most
cases it happens because Windows bootloader is damaged.
For example, when trying to start the system you have errors such as “BOOTMGR is missing,”
“An operating system wasn’t found,” “No bootable device found” and so on.
The bootloader can be damaged after installing another operating system on this computer,
trying to use the free space in hidden partitions or format them, a failure when installing
Windows updates or other system problems, a virus attack etc.
Before you start fixing this problem, check the boot sequence in BIOS or UEFI.
It could be the root of the problem with booting Windows.
So, the first method to fix the botloader will work with all versions of Windows: 10,
8 and 7 (in my case, it is Windows 10).
All you need is a recovery disk, or a boot disk /flash drive of the same bitness as your
system (in case of Windows 7, only a boot disk /flash drive can be used).
If you don’t have any, you can use another computer to create them (you can watch my
previous videos to see how to create a boot flash drive or a recovery disk).
After that adjust BIOS or UEFI settings to boot from a disk / flash drive and enter Windows
Recovery Environment.
In the recovery environment, click on Troubleshoot / Startup Repair (in Windows 7, it is also
“Startup Repair”).
Select Windows 10 as the target system and wait for the process to finish.
When it does, the computer will restart into the restored system (don’t forget to change
the boot priority to hard disk in BIOS or UEFI).
If you saw a message that restore wasn’t successful (it’s often the case), try another
method.
It is also good for Windows 10, 8 and 7.
As well as in the first method, go to the Redovery Environment, click “Troubleshoot”
and start Command Prompt.
Then enter the command “bootrec /fixmbr” to rewrite Windows MBR in the system partition
of your hard disk.
When it is over, we can see the message that the operation is completed successfully.
Using this command is not always enough (for example, if the bootloader failure was caused
by a virus).
That is why enter the command “bootrec /fixboot” to write a new Windows master boot record
in the system partition.
When it is over, close the command prompt and boot from the hard disk.
Now you are not supposed to have any bootloader problems.
The third method will work with Windows 8 or 10.
As I have shown earlier, go to the Command Prompt started in the Recovery Environment.
Enter the command “diskpart” and then “list volume” to see the number of the
hidden partition.
If you have UEFI, this partition will have FAT32 file system and the size of 99-300 Mb,
and in case of BIOS, the file system NTFS and the size of 500 Mb or less.
In my case, it is “Volume 3” of 99 Mb with FAT32 file system.
You should also look at the letter of the drive where Windows is installed (in my case,
it is C).
After you have seen that, enter the command “Select volume 3” (that is, you select
this partition and work with it), “format fs=fat32” (that is, format this partition
in teh file system it had before), “assign letter=Y” (assign a letter to the drive;
you can choose any letter which is not in use now), finish the work of Diskpart with
the command “Exit” and enter the following command: “bcdboot C:\Windows /s Y: /f ALL”
(where С is
the system drive letter; Y – is the hidden partition letter which you assigned) and wait
for the process to finish.
After the process is complete, we can see a report saying that boot files have been
created successfully.
Enter “Diskpart” again, then “select volume 3” (where 3 is the number of the
hidden partition for which you have assigned the letter), then “remove letter=Y” (that
is, delete the letter of this hidden partition, so that it is not shown in the system) and
finish the work of Diskpart again with the command “Exit.”
After that, close the command prompt and restart the computer (don’t forget to change the
boot sequence in BIOS or UEFI to hard disk).
Now Windows bootloader should run properly.
Thank you for watching and good luck!
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