Hello Threshnik,
Good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Please try creating a new local administrator account first
https://support.microsoft.com/en-us/windows/cre...
After that, login to the new administrator account
Press Windows key+R to open Run then type: netplwiz
Press Enter
Find the old administrator account in the list then click Remove
Click Yes
Kindly let me know if this helps or if you have any further concerns.
Kind regards,
John DeV
Independent Advisor