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Move the current library to some other place, or rename the calibre library folder. Then calibre should start and create a new empty library. (Haven't tried it myself...)
Goto preferences in the GUI. There you can specify if metadata should be read from the filename or not, while adding books. A tick box.
And when you add books from the old calibre library folder, use method 2, Add books from directories, including sub-directories (One book per directory, assumes every ebook file is the same book in a different format).
I don't think that this will restore custom columns, but hopefully "standard" metadata will be restored.
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