Sound

I have just formatted windows 8 and installed windows 7.. now i have a problem with the sound in the game.. i can hear the nades(flashbang..what ever) , radio messages and headshot stuff but i cant hear footsteps and gun fire..

Things i have done to make it work ( so dont say these stuff )
1- Re-download
2- Re-install
3- Firewall things
4- Virus things
5- Drivers
6- Meh nothing works

Some windows 8 dont work for crossfire @Raissus also try updating your drivers in windows update