DirectX® 8.1 Wolfenstein: Enemy Territory requires you to have Microsoft® DirectX® on your computer, but it is not included in the download. If you do not have it, are not sure, or are having problems with it, please refer to the DirectX website for further information or localization updates. http://www.microsoft.com/directx Q. What is DirectX 8.1 and why do I need it? A. DirectX 8.1 is a set of sound, video, input and network functions developed by Microsoft. Wolfenstein: Enemy Territory utilizes the functions that are included with DirectX 8.1. Q. I already have other Windows 98/2000/ME/XP games installed on my computer. Will the Microsoft DirectX Installer change my DirectX files? A. If you already have other Windows 98/2000/ME/XP games on your computer, chances are you already have a version of DirectX installed. In this case, the Microsoft installer will detect and overwrite any previous versions with DirectX 8.1. At that point, you will need to restart your computer for the changes to take effect. If, however, you already have DirectX 8.1 installed on your computer, the Microsoft DirectX 8.1 installer will detect it and not overwrite any DirectX 8.1 files. You will not need to restart your computer after installation in order to run Wolfenstein: Enemy Territory.