Ok my friend it seems you have a serious problems in your hands running silent hunter 2, well first you must clean your comp of any unused programs cause you need some resources free, you seem to install everything correct, the game, patch 1.1, messeng what ever is call, but you have a "JANUS", ERROR RIGHT?, well go to the download side and check the site for this game, pleanty of download moods, including one for the janus error you get, but is most likely a video card issue, i remember having the same problem way back, change video card and now im a happy sailor, but try the different patches they have and see if they work. if not let me know and i see what i can do, i havent install or play this game for years now, but i give it a go and see if i can be of help.
DONT GIVE UP.
