most likely you have not created a DVD movie disc..I bet its just basically a data disc at this point...DVD compliant video is NOT what you downloaded (most likely), rather its in a format for play on your computer...to play in a DVD player it will need to be converted to DVD format...I recommend Nero7 as a very simple tool to do it for you..

if you have further interest in this subject, might I suggest visiting the following website: http://www.videohelp.com/