Show Administrator Account Again In Windows 7?

I was trying some stuff that other day and I made an account and made it administrator type and made another one with a standard user type, now the problem is I have hidden my administrator account and I can't bring back because I can't access nothing from this standard user account, everything that requires an administrator perdition just give me that message "DO YOU WANT TO ALLOW THE FOLLOWING PROGRAM TO MAKE CHANGES TO YOUR COMPUTER" there is OK and cancel but I can't press OK, I tried changing the dword value to one But it says I am not permitted or something like that, I tried going through dos But i couldn't it says access denied.