I have uninstalled all codecs that I've found on my Computer. I uninstalled my video drivers and reinstalled the newest Nvidia drivers. Maybe I should try older drivers, any suggestion which ones? I got GTX 780ti. Thank you for trying to help. I'm quite desperate and a complete reinstall of OS is out of the question.
Roll back Nvidia drivers one version down. Sometimes newest ones can cause lot of troubles. Also if you are on laptop, check out if you have Optimus system and try to force graphics card for the game.