Can anyone give you their product key for Majesty 2

When you first install your game, you have to click I agree to the terms of service. In the terms of service (TOS), it will tell you if your key is for your single computer, or if it is licensed to a certain amount of computers. If you violate this, you could loose technical support for your game, or worse.

If you lost your Majesty 2 game code, or you downloaded it from a P2P site, it would just be best to either purchase a new copy, or contact the technical support of the game and ask if you can get a replacement code. Some will do it if you can provide prof of purchase.