Hi dedza,
As vin_sun has said, if you register your licence key in your forum profile you will be able to get better help. For example, there is a great amount of information about this particular mission on the "Missions" board. It is also a good idea to enter your nationality in your profile too, this makes it easier for us to reply knowing that perhaps you are, or are not, used to the English language.
Just as a final point, the mission you are talking about is, in fact, one which is sadly unplayable in it's present form. Do register and then we can give more assistance, quite apart from the fact that you will have much more stuff to read about the game.
Regards,
Traddles.
