i know you can use windows media player to burn music to blank cds so i think it can also burn video files to dvds. if it cant then you can watch the video files on windows media player.
The operations are not difficult. First, download the videos to your computer, download a DVD burner and run it. Second, load files to DVD burner, insert DVD disc, make some operations like editting...
If the files are on the computer, then all you need is a blank writable disc and a burner like Nero Express.
However, it is not free, but it has a trial version...
You use video converting software to make your AVI files DVD compatible, AVI codecs are used by the software to convert from AVI to DVD format.
For Mac users:
What you need is a Mac DVD...