If you're on an older computer (e.g., Window 98 Release A or earlier) you might not have DirectX installed. DirectRT requires version 7 or later of DirectX. You can tell what version you have (if any) by typing "dxdiag" from the Run command on the Start menu. If you don't have version 7 or later, you can get it from [URL]http://download.microsoft.com/directx[/URL]
