That means the patch did not find the expected localization information in the registry, either because it was not created, or because you have a different localization than the English UK / North American version.
Did you install the game from an account with administrative rights? Are you trying to play the game under the same account you installed it from?
There is a download and description of a reg file in
this topic to add the required registry entries or simply change the language version to 'English' (which is what the patch is looking for). Alternately, you can email Larian's support to get a vbs file which will do the same thing in a much more user-friendly manner.
