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Looks like Calibre has forgotten the location of your library. It should be recoverable, unless something has deleted the folder from your computer (third-party uninstallers often do this, and for this reason it's a bad idea to use them).
If you don't remember where your old library was located, search for metadata.db file on your computer - it should be in the same folder as the books are (grouped by authors). If you find your library folder, point Calibre to it - click on the library icon, switch/create library, use the previously existing library... Navigate to the location of your old library and click OK.
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