Can't start FM 9 on Windows 7: "cannot initialize dictionaries"

I am trying to move a copy of FM 9 from an old laptop to a new one running Windows 7 Enterprise. My IT guy reinstalled the software from CD and applied my license key. When I try to start FM, it gives this error during the "Core" startup: "FrameMaker cannot initialize its dictionaries. Either the LanguageDir entry specified in the initialization file is missing or incorrect, or the files in the LanguageDir are missing or corrupted."

I still have the old laptop, so I can compare and copy the files and directories directly. As far as I can see, the LanguageDir entry in the maker.ini is identical on both machines. Both have a dict folder, and I see the same number of files in both. Just for good measure I copied the old folder's contents across to the new folder, but that didn't help.