Please try to turn off other running programs like Skype, Fraps etc. and then start the game.

If it doesnt help send us dxdiag and files from this folder: "C:\Users\<Name>\AppData\Local\DayZ\"

Can you pack the files in winrar and upload it somewhere please?
When the *.rar will be smaller than 2.097k, you can attach it here. Thank you.

When reporting please refer to "How to guide" http://feedback.dayzgame.com/how-to-user.html

Closing Skype and other programs didn't help...

Could it be a problem with my video card drivers?

I uploaded everything from inside that folder like you said, it's here for checking.

seems like the dxdiag is still missing:
http://en.wikipedia.org/wiki/DxDiag

I just added the correct files komin.

This issue was processed by our team and is being looked into. We thank you for your feedback.

Please keep the issue monitored to see when it is fixed.

Looks like that your game has problem with locating a running instance of Steam. Try to run Steam as Administrator, if it wont help try to reinstall Steam. It also can be caused by non standard version of Windows or some other software that you are running in your PC.

I tried testing it right now but the Wait for host that is happening to everyone is not letting me do so... but I will test as soon as I can! Also, could it be a problem with a program called ASRock exTreme Tuner? It's used for overclocking.

Thanks for all the support so far!

And I can assure you my Windows is okay, it's updated and original, no problem with that most probably.

Running as Admin didn't work out, I'm currently reinstalling Steam and if that doesn't help I may reformat my PC... the time had come anyway, really long since I last did it.

No success Komin, I did unninstall every unnecessary program, even my anti-virus, but nothing changed. I reinstalled DayZ and Steam. I still get the crash.

ASRock exTreme Tuner could be part of problem, try to turn it off and run game without it.

Already did, nope. Here's a list of programs I'm running while testing: Steam (obviously), SteelSeeries USB Soundcard, Logitech Gaming Software, Avast, Eraser and Catalyst Control Center. That's all.

I also tried disabling Eyefinity and using only one monitor screen, but it didn't help.

I tried running the game through the Steam folders directly and I got the following message, just like you said: Unable to locate running instance of Steam.

The game started and ran normally, then crashed again.

That could be a different crash. Go to this folder "C:\Users\<Name>\AppData\Local\" and delete DayZ folder. Then run game manually from Steam folder, wait for crash and then send us files from here "C:\Users\<Name>\AppData\Local\DayZ\"

Then delete DayZ folder again, run game normally via Steam Library, wait for crash and send us files from here "C:\Users\<Name>\AppData\Local\DayZ\"
Thank you

I uploaded both folders, the first one running directly through the folders and the second one running from Games Library on Steam.

Did your game crash when you run it from Steam Library? There are no crash dumps in RunInLibrary.rar. Can you try it again please?

No crash dumps are created when I run through library. It crashes but there are no files created.

I've already tried to reproduce the crash for 15 times and no files are created, I guess it's because the game doesn't crash, it just gets minimized and I'm not able to go back to it...

After reinstalling Steam, the DayZ.rar I uploaded was all I could get AppData\Local\DayZ\ after another crash running the game from my games Library.

I will create another topic, because my problem is totally different than what I thought...

My problem is another one, and I am creating another topic.