Hi I've downloaded several demos (from nvidia site) featuring shader effects, it's said that these apps are compiled with DX 9.0c, but I had DX 9.0b; I tried to run them but I received an error expressing that I do not have the file d3dx9_25.dll, so I got it from web, copied it to the system32 folder, the problem still persisted, I downloaded DX 9.0c redistributable (about 35 mb) and installed it, now I have dx 9.0c, but the problem still persists, what does the file d3dx9_25.dll do and what should I do with it? where should I place it to be able to run these cool effects? www.galaxyroad.com, soon will have english contents too...