1: Download this mpdata file.
2: Go to Start -> Run-> Type regedit -> Hit Enter.
3: Go to HKEY_LOCAL_MACHINE -> Activision -> Call of Duty 4
4: Double-click codkey
5: Save the key in notepad
6: Replace the key with: DL2J8PY44Q22GE4888D2
7: Press OK and close regedit.
8: Navigate to your Call of Duty 4 profile folder (typically “C:\Program Files\Activision\Call of Duty 4 – Modern Warfare\players\profiles\your_user_name”)
9: Back-up and then remove all the files in your user name folder.
10: Place the mpdata file you downloaded in your user name folder
11: Open the COD4 MP game and check your rank. You should now be level 55 with all challenges, guns, and every camouflage unlocked!
12: Finally, in the game go to Options -> Multiplayer Options -> Key Code and type your original cd key you have saved in notepad.
There you go, you now have everything unlocked.
Enjoy it .
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