Dell Notebook password locked

Hi,
I'm new to this website and I am hoping someone can help me with my dell inspiron notebook. It's been sitting in my closet for the past 2 years because it suddenly became password protected. I didn't add a password (although my daughter is not sure if she did accidentally). We've tried ever password we could think of and none worked. I called Dell and they pretty much said they can't help me. Can anyone help me get past this problem? I do not care about the contents on the computer any more. I just want to be able to use it. (or give it to my kid.)
thanks for any help you can offer.

http://www.techspot.com/vb/topic97423.html
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Also if you can prove it's yours (not saying it's not) then Dell should help