BootMGR is missing problem

[Daanish]

So it has been a few months since I upgraded but all of a sudden I turn on my PC and it comes with a message.
"BootMGR is missing"
"Ctrl Alt Delete to restart"
I have put in a Windows 7 disc but it isn't loading up.
Can someone help me?

 

[Regedit32]

Do you have a Windows 10 disk?

Or did you at any time create a Windows 10 Recovery disk?

 

[Trouble]

You're likely going to need the installation media at a minimum as Regedit32 is suggesting.
https://www.microsoft.com/en-us/software-download/techbench
Choose Windows 10, the first item in the first drop down (not single language at the bottom)
Next choose your language and your bit version (32 or 64 bit to match your system architecture or in the case of an upgrade, to match your currently installed version of Windows).
That will provide an ISO that will upgrade, repair (or clean install) either or both Windows 10 Pro and Home.
Once you have downloaded the ISO you can use ImgBurn to burn it to a DVD http://imgburn.com/index.php?act=download
OR
Rufus to burn it to a USB ThumbDrive http://rufus.akeo.ie/

When you've managed to boot from the installation media you need to click the Repair Your PC link on the second page after the Choose a Language and Keyboard layout page.
That should get you to the Advanced Troubleshooting options, where you should have an option to launch a Command Prompt from there type
bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
exit
remove the installation media and reboot your PC, see if that helps.
https://support.microsoft.com/en-us/kb/927392

 

[Saltgrass]

This is another link which has been updated for Win 10.

https://support.microsoft.com/en-us/kb/2622803

Make sure and check your bios for the correct boot device.