use something like tmpgenc dvd author i think, but u on;y get it free for 30 days do a search on the above website. but u need to convert avi files to mpg first which can take the best part of 24+ hours and the quality isnt all that good.

try going to www.dvdrhelp.com top site gives u all info u need to burn dvds

what program do you use to convert mpgs and avis to .vob files? all the dvd burning progs i've installed require .vob files and have no facility (as far as i've found) to convert standard video files to vob files

cheers