Hi, if your talking about burning a movie downloaded from LW get the demo version of dvd santa it converts your files and even automatically joins them to fit on 1 dvd disk, I've tried heaps of different programs and found this 1 to be the easiest, download that and if you like you can then purchase for $30.00 (the demo is free and a full version of the software, it just has demo across the top of the screen for about 1 min and then it goes, I haven't bothered purchasing as the demo is just fine )

Hope this helps... it works well for me .....good luck