Deborah when I see a desperate yelp for help like that I feel your pain. I wish I had better news and I hope someone stops by here to help you. I might be able to work it, I do problems like this with friends but I have to be there punching the keys.
I might be contradicted on this and I would tend to believe any contradiction. I'm not an expert but if you did a backup I'm thinking its a Windows type backup.
You would have to use your recovery disks or factory restore disks first to get the OS back on the machine. Then go to Windows backup/restore and it might would bring your files back.
I just in the last few hours did a complete factory recovery on mine, from F11 and it never asked me was I the administrator. It was pretty smooth. I'm not sure why your's is complaining it want's to talk to the administrator. Again, I hope someone jumps in here. Jack ":-\