LOTR - conquest

I've got the problem. See, downloaded the game and installed, cracked etc. My problem is that when i want to start it, it says write your serial key again, to insure safety or smthn, otherwise you can't start the game. I tryed with different keys, none of them works. I'd ask any of you to help me with this, and if someone can, give me the serial key which he uses on pvt. Thanks in advance
Gratz, Jaka