1. If you do not have ZLOEmu account, then register. Account will be needed for playing the game.
1.1 Download and install DirectX.
1.2 Download the game
1.3 Run or download and install ZClient (Instructions for ZClient).
1.4 Update PunkBuster. HERE you can download the updating utility.
1.5 Install PunkBuster using THIS utility.

Launching

2. Launch ZClient. Make sure that you are logged in (ZClient is always needed for launching the game).
2.1 Launch Battlefield: Bad Company 2, using ZClient. At the bottom of ZClient choose Battlefield: Bad Company 2 and press "Run".