Windows 10: How to remove an os

Hello everyone!, Recently,I was fixing my PC which had an error and somehow ended up with 2 OS s in my PC.Both of them are windows 10.But one is an older version which I do not like so I want to remove it.But the catch is that I cannot format the disk partition that holds the old win10 version because it was installed in my primary partition which holds the files to run the PC properly.Can anyone plese help me out with this? Issue?

:)

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code:

 

Need help removing hijack malware from chrome

You have so many more steps than my virus removal. Step one reinstall OS, step two don't get another virus.

 

Best way to keep vista clean and healthy

Yeah just caught it there.

I'm going to attempt to have a step by step guide on how to use these programs efficiently.