PunkBuster is installed along with your game, but if you need to install it again, here’s how:
If you were kicked and didn’t see a message, follow the steps in this PunkBuster support article to find out how to see the kick reason in your logs. If you keep seeing this error you may need to reinstall PunkBuster. Make sure that PunkBuster is running and fully updated. We couldn't keep you connected to this server because you have been kicked by the PunkBuster system.You've been kicked from this server by PunkBuster.
If you see either of these messages while playing: If you see any of these, check your firewall settings, and make sure Punkbuster is fully updated and running properly. These codes mean your game couldn’t connect to the Punkbuster servers or Punkbuster couldn’t install an update.
To fix these, reinstall PunkBuster from the latest game update patch.