Now extract both files into seperate folders. 3. Copy the contents of cod4_win32 inside the pb folder: Call of Duty 4\pb\. 3. Now go to the folder pbsetuplegacy-modified you created in step 2. 4. Execute pbsetup.exe and use it to update punkbuster for Call of Duty 4 (there is an image Howto.gif inside which also demonstrates the setup process) How to enable Punkbuster? 1. Start > search programs and files > regedit 2. Open that then right click HKEY_LOCAL_MACHINE, then click find 3. Search for 'codkey' no caps no spaces without the apostrophes 4. What comes up is your key code, open up cod4 and go options > multiplayer options > enter key rOJ17.