How to Resolve - Can I use any Windows 7 disc to fix the "Bootmgr" error, or does it have to be the one I own??

Can I use any Windows 7 disc to fix the "Bootmgr" error, or does it have to be the one I own?

I'm asking this question on behalf of my parents.  They use an all-in-one HP Pavilion with Windows 7 installed.  While trying to fix another problem it was having with the login page, the computer started bringing up the "Bootmgr is missing" error.  I then
looked up how to resolve this using my smartphone, which led to us searching for their Windows CD, which appears to also be missing.
 
My question is - if we can track down another copy of the Windows 7 disc either via family member or purchasing another, will it work the same as if it were the disc they used to install in the first place, or does it strictly have to be that missing disc?
 
Also, if it has to be the disc that's missing, is there anything else you could suggest we do to solve the problem?
 
Thanks.  :)

Anwsers to the Problem Can I use any Windows 7 disc to fix the "Bootmgr" error, or does it have to be the one I own?

Download Error Fixer (Free)

Using Windows troubleshooter:

• Click on Search on Charm bar and type Troubleshooting. Click on the very first option.
• A new window will open. Click View all from the left pane.
• Scroll down to the bottom and click on Windows update.
• Troubleshooter window for Windows update will pop up. Click on NEXT. It may ask you for administrative permission.
• The troubleshooter will automatically detect problems and fix it.
• Now, close this window and try download/install the app which was previously showing error.

Recommended Method to Repair the Problem: Can I use any Windows 7 disc to fix the "Bootmgr" error, or does it have to be the one I own?:

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