My Arma 2 operation arrowhead is not working

[My Arma 2 operation arrowhead is not working]

Thank you so much for the help. I forgot how fun Arma 2 OA can be online. I cant tell you how grateful I am. You were a real help.

[My Arma 2 operation arrowhead is not working]

I have Arma 2, Arma 2 OA, the beta version, PMC, and british armed forces all steam version and its at 1.63. If you have anymore questions feel free to ask. I will check at least 3-4 times a week if not sorry if you waited for a reply.

[My Arma 2 operation arrowhead is not working]

When I load up Arma 2 Operation Arrowhead it says this "No Entry 'C:Users/My Name/Documents/ArmA 2/ArmA2OA.cfg.3D_Performance'". When I load up Arma 2 i cant join multiplayer or play singleplayer. I have reinstalled it a thousand times and it still doesnt work. If anyone knows how to fix it or what this please tell me. I would be very grateful.