Just a re-upload for this since the link was broken...
http://www.mpgh.net/forum/142-call-d...hallenges.html
ALL CREDITS TO - icuigorz
----------------------------------------------------------
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) Now your good to go! have fun!!
If you want the orginal name you used when you made the game for your player simply go ingame and hit the ~ key on the left of the keyboard. Then enter "/name thenameyouwant" without quotes and hit enter.
WARNING: If you don't do step #6 and just quit the game after changing the key back to your original, the next time you load up the game you will get an error saying the data is corrupt.
I have tested this and it works!