Add a new user and make them the Admin. Your average account from day to day is an admin capable account so armed with this I could make a new Admin account then test that account and finally delete/remove the old admin account.

AND A SECOND THOUGHT is that your current account being admin as well you can reset the other admin account's password. Read how at https://www.lifewire.com/how-do-i-change-another-users-password-in-windows-2626068