Can any1 tell me plzzz tht how to install and play crack game of call of duty 6 mordern warefare 2?

i buyed tht cd of call of duty 6 mordern ware fare 2...!!* but i m not able to play it becauzz it says tht i have to crack it.. i extracted the data-02.......etc files and after that all the files which i extracted became 1 file called mordenwarefare 2.rar when i extracted tht thn aftr tht the files which i hav extracted came again...!!* in the cd they hav given directx, windows live, n etc...!! plzzz if any1 knwzz hw 2 install and play plzz reply n help