Sounds like you might have installed it while the game was running (or you had Near Infinity or Shadowkeeper or some other program like that open). Try re-installing and making sure that the game isn't running.
Hi! I've just installed Solaufein mod v.96, and when I leave the Drow city Sola appears, starting a dialogue but the dialogue box is empty! Please help me, I don't know what to do!!! I don't have other mods installed...