EDIT: We figured out how to fix it. If anyone else is having this problem, you need to delete the DayZ folder in C://Program Files (x86)/Steam/steamapps/common, the DayZ folder in your Documents, the DayZ folder in %localappdata%, and also the dayzlauncher folder under BohemiaInteractive in %localappdata%. Then you need to uninstall and reinstall the game.
My friend is not able to join any servers. When he tries to join a server, no matter what one, it says that he is in position 1 in the queue, however it never puts him in the server. He has tried leaving and re-joining, re-installing the game, and deleting the dayz folder in documents. Nothing has worked so far and we can not seem to find a solution. If anyone knows how to fix this or has the same problem let me know.