Hi, I have absolutely same problem
I have original (buyed) arma 2 and after instal when i click to icon start the game don't doing anything. In autorun on cd is play button gray. I reinstal the game but it is the same. No error, on bluescreen but game not found
My hw: Win XP sp3; AMD Athlon 64X2 2,8Ghz; 4GB RAM, Ati Radeon 3870 512MB (Ati catalyst 09.6)