NOTE: The following procedure will not delete your progress.
For more information, see also: Steam save files location
Uninstall the game completely and re-install it by doing the following:
- Open your Steam software and go to the LIBRARY tab, where you will find a list of games that you own on Steam.
- Find Dying Light in the list and right-click on it. Next, select Manage -> Uninstall from the menu.
- The last thing to do is to confirm your decision by selecting the Delete option, which will uninstall the game.
Having uninstalled Dying Light, select it again in the Library list and click the INSTALL button to the right of the list - this will initiate the download and installation process of the game.
Fore best results, re-install the game directly from Steam, rather than from your discs.