If launching through Steam and a pop-up for "Preparing to launch..." appears briefly but then the game will not launch.
If you are using a physical Disc version of Broken Sword 4- The Angel of Death, firstly reinstall the game using your installation discs.
Ensure your Graphics Drivers are up to date and any Windows updates have been installed.
Verify the Integrity of your Game Files first (a guide can be found here: Guide to Verify Game Files).
Download the DirectX End-User Runtime Installer available from Microsoft here: DirectX End-UserRuntime Installer. You will need to run this as an Administrator (right click on Installer after download and choose the option: "Run as Administrator").
If the game still does not launch afterwards, please contact firstname.lastname@example.org with details on the issue and details on your Computer's hardware, and versions of Operating System.