Do you have any mods? Here's what I'd do: uninstall all mods.then try again. Then if it's the same, I'd reinstall the game. If it's still broken, I'd uninstall again, clear my registry and reinstall with the Internet deactivated. Then only turn it on once the game is running. If it still doesn't run, then I don't know if Mike can help you, but at that point I myself would also consult him.