hi , i just got arma 2 and i want to combine it with my installed arma 2 operation arrowhead but i dont know how . should i uninstall operation arrowhead first and then install arma 2 but then what or can i install arma 2 with the exsisting operation arrowhead but still how can i combine . i found some threads in he official page but they are very confussing and i asked they said that inorder to play on the servers here you must have combined operations so plesae can someone help me :) thanks in advance