Audio Problem

[whiteboy523]

Recently my audio stopped working on my cod 4 and gta iv and other games but it worked before no i cant cant hear anything but my sound works on youtube and other places what could be the problem.

 

[mi1ez]

Could be direct X. Head over to microsoft and hunt down a download

 

[whiteboy523]

Could be direct X. Head over to microsoft and hunt down a download

It said i have already installed the latest version. but i did have sound on arma ii when i play that.