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This error simply means that the command did not automatically find the boot configuration data store. The partition targeted by the boot configuration utility does not contain a Fat32 formatted EFI partition on the hard disk.
If you receive the following message when you execute a command on bcedit.exe:
The boot configuration data store could not be opened
See which of the following options will help you:
Run CMD as administrator and execute the following command:
bcdedit /set {current} Description “TheNameYouWant”.
Go to a high CMD:
bcdedit /store c:\Boot\BCD
This gives you a list of options.
Perform the following steps:
bcdedit /store c:\Boot\BCD /set bootmenupolicy Legacy
Restart your computer, select your Windows and press F8 immediately.
Change the start mode
As some concerned users have already mentioned, when you boot the machine, you must make sure that you boot from the same partition that was used to create the disk, so that BCDEdit works as expected. The fastest way to do this is to change the BIOS mode. This is done via the BIOS settings, but varies from one computer to another depending on the manufacturer of the motherboard and the version of the BIOS it contains.
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Reinstall the system
If all the above methods do not work on your computer, you have no choice but to reinstall Windows 10 as the final solution. Although reinstalling Windows can be problematic, it can help.
However, if you reinstall your operating system, the files in your system drive can be deleted and all your applications must be reinstalled. We therefore recommend that you back up your files before reinstalling your system.
BCD Fixing
All the problems described above have in common that you can no longer boot on Windows. Therefore, you cannot use tools such as Visual BCD Editor to solve the problem on the computer concerned because you can no longer boot on Windows.
In general, you should boot in the advanced boot (Windows 10 or 8.1) or system recovery (Windows 7) options and run several commands from the command line.
If you have Windows installation support, you can boot from it and access the recovery options.
Windows 10 users can download media from Microsoft instead.
https://h30434.www3.hp.com/t5/Desktop-Boot-and-Lockup/Boot-config-data-store/td-p/6469872
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