That error indicates that the game wasn't installed correctly. Please uninstall the game and then follow the directions below.
Right-click the .zip file you downloaded from our site and click Extract All. Once this finishes, it should open the directory that the files were extracted to automatically. Run the JurassicPark100_Setup.exe file in that folder to install the game.
Again, make sure you're completely extracting the files prior to installing it. Running the setup from within the .zip file itself will result in that error 100% of the time, and it's the only thing that would cause that error.