Thanks for the prompt reply, Kovid. I had found the troubleshooting process you linked to; I even printed it out but with negative results. I did not record or save the various error messages generated when attempting to enlist the then-existing metadata.db file. I recall that the previous size of the Windows 7 Calibre Library was in excess of 1GB. I suspected something wasn't right when (again, I suspect, after having opened both portable.exe and calibre.exe) I noticed the metadata.db file size of approx 128Kb.
Perhaps it was my lack of knowledge when opening more than one version of Calibre. If that's the case I blame myself, as it appears that at this point I might never be able to find, much less save the previous Windows Library.
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