Hello Vincent-tedd
It looks like you were using any other account that belonged to the Administrators group, probably the one Windows allowed you to create during the installation process.
Reason
By default, the built-in Administrator account is disabled so it is unlikely that you were using it unless you have manually enabled it from the
Computer Management snap-in. Also, you can't delete the built-in Administrator account. It is only possible if you play with the registry.
If the account you were using is deleted and so are its document files, you may have to use any efficient third-party data recovery tool such as
Recuva or
EaseUs Data Recovery.
To get back your account, you can either
Create a New User with the same name or
Restore Windows to an Earlier State, i.e. when the account existed.
Feel free to report back if further assistance is needed.
Cheers!!