Lugon

Hi, when i want to start the game, it crashes with - Arma 2 stopped working. I have switchable graphic and when I start game with using weaker Intel graphic, game starts, but when i use my Radeon, game crashes. I have tried running game as administrator, veryfying game cache, updating drivers... Any advice? Thx My specs: Dell Inspiron 15R Intel Core i7 4500U Haswell RAM 8GB AMD Radeon HD8850M 2GB W8