I fixed it. I did a complete reset of the PC ... fixed it then. So thanks I guess

What shall I deinstall or reinstall?

Ok there it is. What am I supposed to do with it?

nothing changed man. I tried that like 100 times

No, theres nothing there{F850389}

If with "root folder" you mean the normal Steam/steamspps/common folder, then there is no such folder as "Redist"

I reduced it to only one output device. So I plug my headphones directly into the front of my PC and disable all the other output devices. This one can not "disappear" for it is in use. There is Teamspeak and maybe YouTube or spotify on that channel, too.
It rather seems to me that Dayz has a problem with DirectX or something. Otherwise... directX works all right. Whenever I start the game, steam says "first installation" and checks some directX stuff.

@Lex @Geez please help me. Is there nothing else I could try? I would really love to play the game.

I tried but nothing changened, unfortunately.

No the game works with neither.

No theres is absolutely no problem with ot and the drivers are all up to date

Tried it with onboard sound card, as well as external Sound BlasterX G1 sound card.

@Lex Yeah, I did so. It didn't work, though, unfortunately.

@Lex I revisited your comment and followed our word for word. Still no sound unfortunately.

I actually didn't quite get 100% , what exactly you meant by that. But I think I worked my way through your steps and it didn't work either.

I reinstalled a couple of times, tried different drivers. everything. every other game works.