If you simply copied the library folder over to your new computer, you can't use the export/import function (you should have used the export function instead of copying). But you can still get your books to Calibre. Right-click on the Library icon, Switch/Create library, Use the previously existing library at the new location. Then browse to the folder your library is in. Click OK. Now you should have your library in Calibre, if it's intact.
And don't put your library in the Documents folder, just in case.
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