Windows 10 won't boot BOOTMGR IS MISSING , BOOTREC /FIXBOOT access denied

[clubman]

Guys, help me out on this. I think the problem started since I disabled Cortana with changing "her" folder's name. Since then, except the fact I lost search options in start, sometimes my pc stucks on Asrock logo boot screen with a circle loading under it and cannot boot Windows (I only assume it is from Cortana, because I haven't made any other changes since then). Until now, startup repair under advanced options worked for me each time I could'n load Windows and the system booted fine. But now, I have got a message that startup repair cannot repair what it needs to repair. I have read somewhere to try to fix in cmd the boot with bootrec commands fixboot and rebuild*** but access is denied. I tried to boot Windows 10 with installation usb flash, but got a message bootmgr is missing. Any advices?
Update: I was able to boot in Windows 10 installation usb flash drive. What now? Try some sort of repair?

 

[clubman]

Depending on how you do it, re-installing will delete
1/ everything
2/ the OS only

However that will mean any programs will need to be reinstalled, as their registry entries will also be deleted.

Anything in the "My" folders (My Music etc), may also be lost.

There is a repair option on the Win install disks, but I have never known it to work; you could give it a try (nothing ventured, nothing gained).

You could also try a live disk - via a CD or USB drive; of either Windows or Linux, and see if you can repair the MBR that way (or just change the Cortana folder name back).

There are reasons a lot of us still refuse to use Win10.

I would still use my Windows 7, but since my new rig and motherboard compatability starting from Windows 10, that is not an option for me. I will read more about this live disk, but menawhile I am still searching for a way without reinstalling, and try to make it work using cmd commands (actually reinstalling is the last pillar to hold on to).

 

[clubman]

I'll try the following https://www.youtube.com/watch?v=LCOTKbIRpOA
I think I have tried so many different commands, that maybe I have messed up things even more. Now I have even second windows boot manager as a boot option from the drop down menu in the UEFI control panel (I thinks it's beacuse I have created new boot point).

 

[USAFRet]

There are reasons a lot of us still refuse to use Win10.

In this type of situation, Win 10 is no different than 8.1/8/7....

Too many attempted workarounds from an initial failed disabling of "something", results in a borked up system.
It was just as easy to screw up Win 7 as it is Win 10...if you do it completely wrong.

 

[clubman]

There are reasons a lot of us still refuse to use Win10.

In this type of situation, Win 10 is no different than 8.1/8/7....

Too many attempted workarounds from an initial failed disabling of "something", results in a borked up system.
It was just as easy to screw up Win 7 as it is Win 10...if you do it completely wrong.

Still got hope, man. But thanks.

 

[clubman]

Hm, I got an idea. What if I remove the SSD, then plug it in my external 2.5 hdd slot with usb 3.0 in my laptop, then read it, open System32 and replace the boot file with a working one?

 

[USAFRet]

Hm, I got an idea. What if I remove the SSD, then plug it in my external 2.5 hdd slot with usb 3.0 in my laptop, then read it, open System32 and replace the boot file with a working one?

You are very likely to makes another level of 'worse'.

 

[clubman]

Hm, I got an idea. What if I remove the SSD, then plug it in my external 2.5 hdd slot with usb 3.0 in my laptop, then read it, open System32 and replace the boot file with a working one?

You are very likely to makes another level of 'worse'.

I could try to re-enable Cortana by undoing the steps I did form here https://superuser.com/questions/949569/can-i-completely-disable-cortana-on-windows-10 , section 52:
Open Task Manager and have it show More details. Right click on Cortana and select Open file location.

Task Manager

Now find the Cortana folder, right click it, and select Rename. I would recommend just adding ".bak" to the end of the folder name so you can find it easily if you want to restore it back to it's original status.

Rename

If you attempt to rename, it will tell you that the folder is in use.

Folder In Use

This is when you want to go back to Task Manager, right click on Cortana, and select End task.

End task

Right after the task ends, switch back to the Folder In Use window and click Try Again. The folder should be renamed and the Cortana task will not start again.

 

[clubman]

Hm, I got an idea. What if I remove the SSD, then plug it in my external 2.5 hdd slot with usb 3.0 in my laptop, then read it, open System32 and replace the boot file with a working one?

You are very likely to makes another level of 'worse'.

I opened my SSD with the help of the external 2.5" hdd case. I see that I have multiple EFI Folders

I:\Windows\Boot\DVD - there are two folers here EFI and PCAT, inside of each one there is BCD file 16kb with a few other files

I:\Windows\Boot\EFI - with a lof of language folders and files, but missing BCD file

I:\Windows\Boot\PCAT - with a lof of language folders and files, but missing BCD file

I:\EFI - this EFI folder is freestanding in the main directory and was created on 20.05.2018, probably when I created a second boot option with one of the commands used; containing two folders: Boot and Microsoft ; In Microsoft there are Boot and Recovery. Inside the Boot there are lagnuage folders and BCD file, and in the Recovery - only one BCD file

 

[clubman]

Performed a clean install . PICKED AS THE SOLUTION !!! BEST ANSWER :|