What is the Call of Duty 4 Modern Warfare install code

Considering that the last answer here was offensive and not useful in any way what so ever, I deleted it.

Now, most of the time the CD keys for games can be found inside the CD case, on the back of the manual that came when you bought the game :)

If it isn't there, just look in the case and on anything that came with the game. Still not there, you might want to contact the store where you bought the game since it's missing and is needed to play legally online.