Windows 10: Can you factory reset a School laptop with admin rights and User Account Control

For some reason the laptop would'nt let me reset the system and when I went to the Reset PC Option It would want me to enter UAC Admin's Password and Username and I tried to advanced options but when I went to troubleshoot and Reset This PC Remove everything it just puts me back to the Choose the options when i do Keep files it would just say Failed please try again laterAny help please Thanks.

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How to Factory Reset an old school laptop

Okay so a bit of back story: I used to go to this one school where they wanted us to bring our own laptops from home so that they can put their system on it. I gave them my Dell Windows laptop and they reset it to be a school laptop. It has blocked websites, admin passwords that I don't know, random school apps, etc. I've graduated and I still have the laptop but they didn't remove their system from my laptop. I tried doing the normal factory reset where you hold down the shift key then restart and then troubleshoot then factory reset....etc. but that didn't remove the school system from my laptop. it's still there. How can I factory reset it all the way to make the school system get off of my laptop and make it my personal laptop?

I know you've gotta clear the drive and reinstall the O/S but I don't know how to do that without an admin password. I don't know the admin password.

 

User account control

You have two options:

• Ask the school's network administrator to give you the admin password.
• Re-install Windows.

 

No admin for user account controll

HELP PLEASE

I accidentally deleted the admin rights on my computer and I cant get them back, I need a admin for user account control and there IS NO ACCOUNT. I knew the old admin password and I cant seem to find a way to make a account or reset the user accounts. When
the admin password is needed, there is no box to put it in and i cant press yes even though I am in the admin account.