Alpaca

Hi, I've just bought Arma 2: Combined Operations. DVD1" Arma 2 Black Edition" gets installed perfectly but as soon as i try to install Operation Arrowhead i get an error message that it can't find a certain file : data baf.pbo.gz Does anyone know how to solve this problem? Edit: tried once more to install it. Now it took a bit longer to show an error message. So now i'm copying the files from the DVD to my PC to try it once more, but now other errors showed. misc.pbo , misc2.pbo , misc3.pbo, mission.pbo and a bunch of other files can not be copied or found. By now I'm really wondering if this DVD i bought is even playable...