i have downloaded a free demo n then installed it, but everytime i go to play it says
E:\UT2004Demo\System\UT2004.exe
A Device attached to the system is not functioning
and then it says
Error Starting Program
The D3D8.DLL file is linked to missing export DDRAW.DLL 
dEntry12.
You should not have come to OpenGL… The problem comes from DirectX ( D3D8 = Direct3D 8) ! I’m just kidding, we will help you !
Try to start it in OpenGL mode.
To do this, open ut2004.ini in Unreal/System.
Under [Engine.engine] you will see a list of five entries starting with “renderdevice”. One of them has not a ; in front of it, normally the first one.
Make a ; in front of it, and remove the one in front of RenderDevice=OpenGLDrv.OpenGLRenderDevice .
You will be in OpenGL mode. If does not work, reinstall your video drivers, or reinstall a directX version, or reinstall an OpenGL version.
Good luck !