Cod4 multiplayer lag

i run vista 64 bit and cod4 just will not run in multiplayer mode without extreme high ping and lag
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More about cod4 multiplayer
  1. There is a chance that Windows' security programs or third-party software is conflicting with the game. Try running it with Windows Firewall disabled and your virus scanner either set to [Off] or with CoD 4 on the exception list.

    You say that you cannot run the game in multiplayer mode, but how does single player work?

  2. Either the servers you join are hacked or poorly hosted, or you have a firewall/AV or malware software working in the background, flooding the ports your using.

    Also, you might consider running a speedtest on to check your ISP parameters.

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