Call of duty 2 direct x 9.0c problem?

hey friends. i just bought call of duty 2. when i try to play it it says "DirectX Error DirectX has encountered an unrecoverable error. Please check DirectX Help doent for possible details." i tried everything in the FAQ but nothing happened. i updated my graphics card softwares also but still nothing. the main problem is that the game requires directx 9.0c and i already have it installed in my system but still the game does not detects it. i tried to download directx 9.0c from microsoft but the downloaded file just extracts some files which require me to sugest the software to open with. any advice? thnx in advance :)