Have you activated the game files in the launcher (Nehrim.esm and NehrimData.esp)?
If your ini-file is corrupted, you can delete it - the launcher/game will create a new and hopefully correct one. (the file path should be C:/Users/*yourName*/Documents/MyGames/Oblivion if you didn't change the file path in the launcher. Otherwise, it should be in your Nehrim directory).