i got a problem

Hello. For some weeks ago i bought Arma 2, and Arma 2: Operation Arrowhead, and i had a problem i fixed, but after that i didn't lauched it. then my friend asked me about i would like to play dayz with him, and i said yea. so i started to install it again, after that actually tonight we tried to lauch it, and it says some errors: Arma 2 Data file too short 'addons/dubbling.pbo'. Expected 1092528237, got 909639680 B Arma 2: Operations arrowhead Data file too short 'c:/program files (x86)/steam/steamapps/common/arma 2/addons/dubbing.pbo'. Expected 1092528237 B, got 909639680 B I don't know how to fix this, so please help me.

Same with AO.. This is annoying -.-

Hello guys, i tired both thing, and now it says: ''ArmA 2 has stopped working''