Gladiator12

I've been getting errors that certain "Ca" files have been missing whenever I launch ARMA 2:OA. I deleted all the ca files, thinking they were bugged, so I could do verify my cache integrity through Steam. Now that I've done that, I can't start play or edit any single or multiplayer games, because it won't put the files back. How can this be fixed? Also, I'm not sure whether these files are from a mod, but uninstalling and reinstalling Arrowhead doesn't seem to work either.

I bought ArmA 2:CO a few days ago, and when I played it I discovered that I could only play with all settings on the lowest to play without much lag. I used "Can You RUN It" and I met, maybe even exceeded the system requirements for both games. My specs are: CPU:Intel Core I5-2450m 2.5GHz Graphics Card: nVidiA 610M RAM: 8 GB Can anyone tell me how to run this better?