I have 2 Computers.
The First and my main one(Windows 7), does not work. As soon as I start Dayz it tells me, after accepting the EULA, that it is not able to find a running instance of Steam. In the Console it says: "Blocked loading of file: "B:\Steam\tier0_s.dll". For info: B ist an SSD 128 GB for my Games. My main drive is C. Also tried installing Steam on C and running DayZ still the same error.
Now to the info at the beginning:
If I copy my steam folder to an external harddrive and copy it to my 2nd Computer (Windows 10, updated from 8) DayZ works just fine!
Already tried:
Deleting the corrupt Windows Update,
Reinstalling Steam,
because of my bad internet connection I did not reinstall DayZ, only copied it into the Steam folder after the installation, but I dont think it causes the problem, because of my 2nd computer it works just fine.
Verifying game data,
{F33099} {F33100}