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Did you not end up with a folder called windows.old (type %systemdrive%\Windows.old) when you installed Windows 7? - as long as you did not do an installation formatting the drive this folder is created to preserve old settings.
If so, you may find them in there, normally somewhere under windows.old\Users>username, probably in the sub-folder ...\roaming\calibre under that.
If you have done a thorough search, as you say you have, then if they were there you would likely have found them, but it may be worth a eyeball check.
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