There is an administrator account on your pc. Right click My Computer, choose manage, click users and computers, expand users... now you can see the account. You can rename it if you like. You cannot delete the administrator account from your PC. You should assign it a password. You can also create new accounts and give them lesser permissions. This is a best practice. You cannot reduce the permissions of the built-in administrator account, but you can rename it. This is to ensure that you always have at least one account with administrator rights on your PC. You wouldn't want to try running your pc without one.

Best,

Geoff