I have no Admin account now, and keeps asking me to: Type an administrator's name and password to allow this.

i've installed the new beta Yosemite. After i found i didnt like it, i decided to return to Mavericks. Now, at the installation process i dont know what happened and now i dont have any admin account. so, the system keeps asking me to Type an administrator's name and password to allow this. and i cant do anything, because i only have an standard and a guest account. How can i make my standard account an admin one. Also, this makes me sick, because i cant install or configure anything.
ps. i regret about installing Yosemite beta. not good at all
these are some screenshots
http://prntscr.com/4ce3nx
http://prntscr.com/4ce43z

Do you still have a Recovery partition? To see if you do, hold down the command and R keys whilst booting and erase your boot drive and then reinstall the version of OS X that you last paid for or downloaded.
Call back if that doesn't work...
Clinton

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