I am not with Microsoft in any way. Go to the options and change it from 4:3 to 16:9.
windows 7 dvd maker mp4 files Burning mp4 files to DVDs On Windows 7 This video takes you through the process of burning an digital file mp4, avi, etc to a ...
This video takes you through the process of burning an digital file (mp4, avi, etc) to a physical DVD playable in your standard household DVD player.
From Colorado Law
http://goo.gl/SsFto7 Get the best DVD maker for Windows 8 to convert and burn any video to DVD in Windows 8 in high quality, such as AVI, FLV, MOV, MKV, ...
From wonder dvdcreator
Demonstration of the new Windows Vista and the feature of making DVD records. Presentation held at MSN Innovate in Stockholm, Sweden, 7 December 2006.
From Fredrik Wass