neverwinter nights Multiplayer

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hi all,
I just got a copy of neverwinter nights from a friend, i installed it, put the crack on it and it worked fine singleplayer, but when i go to multiplayer it says i have to make an account, so i do that and it says cd key invalid, i just want to play it on my Small network i have at home, if there is a way to be able to play on the net or LAN games can someone tell me?

thanks