Administrator account is lock,no other account available to logon

I am in Big trouble,before i questioned that where is my administrator
account for which i got answer and it work but afterwards ..........
i was using only one account in my vista home premium that is
"Administrator".other standard account i delete and guest account i made
disable.while working in my user account "Administrator",first i changed name
of my user from "Administrator" to "jaquar001" and then in cmd i typed "net
user administrator active/no".
then i made log off.now when i tried to enter my password i was using for
administrator account, i cannot login
error is "The username or password invalid"
i thought with password no problem,but because user "Administrator" i made
disable while in typing CMD, now computer not finding that user.eventhogh
there is no other user to get in ???????
any recovery or safe mod also need atleaste user login to do any operation ?
WHAT SHALL I DO. or i have last way to recover whole windows by sacrificing
on all c: drive data

PLEASE HELP ME !!
i thing it is a big BUG in window vista, that someone can disable
Administrator account while working with Administrator account . ? it should
not happen ...