No Gun Sound No Foot Sounds No Nades Sound :(

I`ve a bad problem with Crossfire I can hear this sounds only (Mission Succ / Fail , Radio voices , Double kill - multi kill...etc and crossfire music )

But Gun sounds , footsteps , grenades , C4 , Ghost Breath , slash sound and relode sound I cant hear them

Windows 7
Updates June 2011

I tried all solution Restart CF and System , Reinstall , Properies > Compatibility ....etc

My Headphone is worked cause I can hear the other sounds in CF and i can hear films and songs.............thats not driver problem the problem with CF

Please Help me !