Have you tried a search on just a particular book that you know was in the library or a search of all files and folders for an author name or book file type?
My laptop died and I lost my Calibre library a few months ago. I had many of the books on my Sony reader and was able to save the books from the reader to the hard drive on the new computer and then load them into Calibre from there. I lost all the metadata but at least I had the version that worked on the Sony and then could reload many of the books back from where I purchased them.
I also purchased a separate USB hard drive and now backup the Calibre library to it so I won't have to go through the data loss again.
Good luck, I hope you can find your library.
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