How can I recover a lost 'admin account' on my PC?

I allowed my daughter to create her own admin account on my computer, but in the process of logging out of mine she lost mine altogether. How and/or why did that happen? I’ve lost all of my documents and pictures, some games I purchased and downloaded to my desktop and all of my preferred settings. I can’t find my admin account anywhere. What steps would I take to recover it? I’m running Windows XP, if that makes a difference.

Or am I doomed?