My advice would be to make sure that you have included all the media with your project; make sure you reference the media in your program using paths from the project folder (i.e. "files/bitmap.bmp") rather than full paths (i.e. "c:\users\dave\desktop\project\files\bitmap.bmp"); make sure your friends have DirectX 9.0c installed (include the installer with your project to make life easier for them); and finally some plugins (Like IanM's Matrix1) require additional .dll fils to be included in the project folder.
