Lorex DVM2050 Owner's Manual page 14

Once Windows Media 9 is installed, you will be prompted with a setup dialog for DirectX.
DirectX is the core Windows® technology that drives high-speed multimedia and games on
the PC. For more information on the features of DirectX, please refer to the following link:
http://www.microsoft.com/windows/directx/default.aspx
An advantage of having a Windows Media platform is that Windows
Media software is constantly being improved. As Windows Media
improves, the audio and video streaming quality of the Digital Video
Security System improves as well!
Follow the instructions of the standard DirectX 9.0 installation dialog, which will guide you
through the installation process.
Digital Video Security System Start Up Guide 11