this is by sofa not me but i tried it and it worked 100% btw if you do not do #6 cod4 will mess up so DO STEP 6!!!!!!!!!!
im sorry about the rapidshare link idk how to upload files here it always says i cant
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When you get to number 3 below make sure you change the key IN GAME or else it will not work (eg, don't use the registry).
KEY CODE: DL2J-8PY4-4Q22-GE48-88D2
1) Load up the game and create a brand new character
2) Go to Options>Multiplayer Options>CD-Key (change it to the key listed above)
3) Exit game and navigate to your COD4 folder and find the newly created character from step #1 and open it up and replace the mpdata with the one posted earlier. You can find the character here - C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles
4) Open the game, you will now have all unlocks and be at lvl55 & commander! That took 2 minutes!
5) Now go to Options>Multiplayer Options>CD-Key (change the key back to your original cd-key)
6) Create your own server with a password and start a map, play for a bit so it saves your data, either finish the round or just exit after playing for a couple minutes. Now your good to go!