Hey guys,
Just some information I wish to share with you in case you didn't know:
If you want to re-install your game, change your key and keep your rank.
1. You have to backup your mpdata file(DON'T OPEN IT NOR TRY TO MODIFY IT) located in the Call of Duty 4 profile folder (typically “C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\players\profiles\your_username”)
2.Find out with what CDKEY did you play with.
Steps:
Go to Start -> Run-> Type regedit -> Hit Enter.
Go to HKEY_LOCAL_MACHINE -> Activision -> Call of Duty 4
Double-click codkey
Save the key in notepad
3.After you have the key saved in notepad and the mpdate file backed up, you can do w/e you want.
After you reinstalled or did w/e you needed to, you'd like to keep your current rank but with a different key.
4.Insert the mpdata file you backed up in your profiles folder, go to the registry and insert the key you saved in notepad before.
5.Launch the game, once you make sure everything is ok and your rank is the same, in the game go to Options -> Multiplayer Options -> Key Code and type your new Cdkey.