I have just spent months creating a graphics application in c# using DirectX 9 (my first attempt) only to find that the finished product does not work on another computer. After hours of toying around with Net Framework 1 and 2 I still can't get my programme to work on another computer. I have also found out that although I can get it to work in c# when I choose F5 (start debugging) it will not work with 'start without debugging'...... but the EXE file will work - only on my computer. There seems to be a problem because I am using 'surfaces' and 'DrawFast' with DirectX and DirectX.DirectDraw. All other programmes I create in c#, using the normal Windows Application projects, work on any computer ... if the other computer has Net framework 2 !!!Malcolm