Windows 10: Why default OS changes after windows update?

I have dualbooted two Windows 10's, and when an update happens on one of them, the updated system goes to default os. I don't want that.

:)

 

Recent (Save Files) - Change Default Settings to OneDrive


Hello -
Thanks for the return. Before I undertake changing the Registry, I have a question.
The steps in my Registry, for my version of Windows 10, were a bit different, but I think I eventually got to the right spot.
The last step is to change the number of places you want to list in Recent Places. In my case, the default Max Display listed 50 as the number. So, if I were to change that number, how do I know the Save As page will be one of those places? Or, a similar question, will this registry change delete the tab Recent from my Save As page? This is what I would like to happen.
When I received my computer in Nov. 2016, the Recent tab was not listed in the Save As page. Something caused it to be added over time. Which brings me to this second question. Would there be any benefit in deleting the changed registry listing and reverting back to the default listing? See attachment.
Jerry

 

HyperSLI (Enabling SLI on non-sli motherboards)

To turn off windows updates in windows 7 follow these steps:

Click the start button, in the search box type in 'windows updates', click on 'windows update'
in the search results list, in the left side of the windows update window click 'change settings'
then in the option bar select 'Never check for updates'.

 

How to make make a particular OS as default boot.

Hi Mohammad,

As per the description, I understand that you had installed two Windows 10 Operating systems on a particular hard drive, where one is genuine.

If you would like to make the genuine Operating system as the default boot, please follow the below steps.

• 
  Press the Windows + R keys to open the Run dialog, type
  msconfig, and press Enter.
  
• 
  Click/tap on the Boot tab.
  Select the operating system you want to delete that is not set as the
  Default OS, and click/tap on Delete.
  
  NOTE:
  If the OS you want to delete from the list is the
  Default OS, then you will need to change the default operating system
  to another listed OS first.
  
• 
  Check the Make all boot settings permanent box, and click on
  OK.
  
• 
  Click/tap on Yes to confirm.
  
• 
  Click/tap on the Restart button.
  

Hope the steps provided helps you to select the default Operating system on boot. Please do let us know if you need further assistance. We will be glad to assist you.

Thank you.