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Nicko - does your Win7 Image have your library and configuration folders on it? The default locations are
Library : Users\<your logon name>\Documents\Calibre Library
Config : Users\<your logon name>\Appdata\Roaming\calibre
If so then restore those files from the Image to the same locations. No need to restore calibre software, just reinstall latest version. If your login name is the same it should just work, if its different just use the Library icon->Switch create library to select the new location.
If you had looked before you leapt you could have done this ==>>
How do I move my calibre data from one computer to another?
BR