This driver has been tested on WinNT4, Win2000, and WinME. Should work with previous versions. If mpeg4 video not run on your system, delete mpg4c32.dll and mpg4ds32.ax in your OS's system directory reinstall this mpeg4 codec in your system directory("Start", "Find" 'file name' right click on the file) and delete it. Extract this file to a temp directory the right click on the extracted file and intall. If it does not play the movie the restart your system.