Sorry, I'm afraid I still don't understand
You said you only had one Admin capable account, your own.
I don't understand what you mean by 'it's lost'.
You also said you can log in with a Guest account, but if that really is a Guest account you would be very limited in what you can do. You would not be able to find files for any other account and you would not be able to create a new Admin capable account from there.
So something is happening that I don't understand. I don't know how you were able to create a new Admin capable account from the Guest account.
Safe Mode. When you turn the computer on, start tapping the F8 key gently, once a second. You will then get a list of Safe Mode options. If you choose the top one, called "Safe Mode", you may be able to access the hidden "System Administrator" account.
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