Cannot Start ArmA:OA (Please help me)

[bewbilicious 0]

I have made posts on other forums but no one has helped me, gotten over 100 views and not a single reply.

I cannot start up ArmA 2:OA each time I try I get an error

"Error Creating Direct3D 9 Graphics Engine"

I have the steam version, I purchased both ArmA and ArmA2, which is Combined Operations? ArmA starts up just fine, ArmA2 works but only if I click the "Launch ARMA 2 : Combined Operations" but when I click "Play ARMA 2: Operation Arrowhead" I get the error listed above.

I have tried to install Dayz with both Six Updater and another called Dayz Updater mentioned on the Steam forums, but still I am unable to play the game.

Can someone please assist me so that I may play the game I paid for.

Thank you in advance

[lvg 1690]

Follow this.

http://dayzmod.com/forum/showthread.php?tid=13684

Also Arma 2 and Arma 2 Operation arrowhead is what makes combined ops.