http://www.videohelp.com/tools
try guiffmpeg or tmpgenc or many of the other various tools to re-encode video to mpeg2
you will also in most cases also need to take the resulting mpeg2 video file and use a dvd authoring tool to create the dvd image so it can be burned.......try dvdstyler or dvdauthorgui
later versions of nero can also do this, however its not nearly as flexible as some of the other tools.......quailty can vary greatly from one program to the next, not all mpeg encoders do a good job
this is one area where windows isnt all that great, its still playing catchup, but software thats free does exist that does work