Hello to all
I found the solution, u will get ur cod4 crashed if u r using xfire for launching the game or if u already used it once and xfire is running in backround, it will still crashes, first att all try to exit xfire and try then, if the problem is still there u have to let pb services to run on desktop, set full control, after that is done u have to instal pbsvc again, and download pb files for Cod4 cuz Punkbuster is not supporting cod4 anymore, when u copy files to pb file of cod4 problem should be solved, those guys from Microsoft are not even tryin to help...
hope I helped, it workked for me
