Ok guys it took a while for me I tried the steam>verify option and it said 2 files were wrong or missing, whatever, but I kept retrying until it only repeated 1 file was wrong so I tried the option next to verify which was defrag, (I think) then did some more verifying, it wouldn't budge from 1 file wrong so I tried sixlauncher dayz despite and it worked, I then started getting kicked saying battleye was not responding but this disappeared so hopefully just verifying and defragging will work for you also, thanks for the help all who have posted thus far