Windows 10: How do I go about deleting one of the two identical OS's on my system? Why are there two...

I installed windows as the operating system and after post it tells me to choose which OS to use between 2 which are both the same Windows 10 Pro, How would I go about getting rid of that?

:)

 

How to delete inactive System Image Restore Points in System Restore

Windows 10 64-bit.
When I click "show more restore points" in System Restore I see a bunch of old "system image restore points" that were deleted in past and do not correspond to any currently active restore points. Clicking any of these old restore points, I simply get an error message saying they could not be found, and to select another restore point instead.I would like to delete these restore points listings but have been unable to do so.
So far, I have tried steps mentioned below without any luck :

Disk Cleanup through (C Properties
Disable System Protection (OFF and ON) in System Protection for OS (C
Disk Space Usage to minimum (slider button all the way to the left then 'Delete all restore points for this drive'),
Delete all shown Restore points in CCleaner (the problem ones do not show here),
Reset Windows Backup to Default in Windows 10 with 'Reset_Windows_Backup.bat' utility.

Any suggestions highly welcome.

 

Deleted icons stay on desktop (not in desktop folder)

I can only suggest that you
1 Add a list of steps you have already taken.
2 Add a comment about restarting the computer. Do the deleted icons disappear then?
2 Add a comment explaining if any Desktop items do delete correctly and whether or not there are any significant differences between those that do delete correctly and those that don't.
3 Add a list of any OS tweaks you have done & any third-party OS-related utilities you have run.

I assume you have already reinstalled your display driver.
I don't see a Repair install as being relevant. Repair Install - TenForumsTutorials

Denis

 

Windows.old automatically deleted the day after installing Windows 10

A simple websearch would have given you info quicker than complaining about someone suggesting to upgrade to Windows 10 and something causing the Windows.old to be deleted, which I doubt was caused by Microsoft.
Rebuild System Partition

The second way here we can put forward is to rebuild the system partition. If you don't want to pay a penny to do the lost partition recovery, try this method. Note that this requires you have the Windows installation disk. Now follow the instructions to begin.
Preparatory work:
Boot the computer using the Windows installation media for your running OS. Then on the first installation screen, press SHIFT+F10 to bring up the command prompt.
Now run the following commands at the command prompt.
Step 1:
bootrec /fixmbr
Step 2:
diskpart
select disk 0
list partition
select partition n (n is the Windows OS partition)
active
exit (exit diskpart)
Step 3:
bootrec /fixboot
Step 4:
bootrec /rebuildbcd