Administrator User Account Lost

I have Win XP. I did not have separate user accounts from the time I purchased it. Hence in the User account folder it always showed Administrator and guest. Today I went into the "Administrator" account put a password into it. I wanted to create another account named "ABCD" by which another user with a separate password could log into my computer. But i saw that Guest account was there which could serve my purpose but i saw that there was no password putting function in it.

Hence I created the "ABCD" account, but somehow i saw that by clicking next, next it became administrator account.

I restarted the computer expecting "Admistrator "Icon to appear which would prompt a password but was aghast to find it starting normally without any user accounts screen....all my desktop items were lost..then I saw that now "ABCD" account had started.

I went in user accounts and saw only "ABCD" and "guest" user account
My question is how do i get back my original user account "Administrator"(in which I had put a password) including my documents & mainly the desktop files and folders which I had.

Please Help me as I had important documents in my desktop.