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Thanks to activision, you must update punkbuster manually to play on servers with pb enabled, some of our servers have pb enabled.Files for Windows : Here Files for a Mac : Here Files for Linux : Here Download the files above and place them in your COD4's PB folder:: > Program Files x86 > Activision > COD4 > PB(Or if you got the game off steam) C:\ > SteamPath > steamapps > common > Call of Duty 4 > pb: > Users > Name > AppData > Local > Punkbuster > COD4 > PB ( Make sure you can view hidden files and folders or you wont be able to see this folder Hard drive where cod4 is installedHard drive where your operating system is installedIf links are broken send me a pm and i will fix themIf you get this issue: Service Communication Failure PnkBstrA.exeThen download and install this