Well i use Nerovision for some things, but i think you cant put subtitles with it, you could always try googling for Avi to DVD guides (here's one i've found
http://www.aoamedia.com/Convert-to-DVD.htm) hope it works. I think i used it like once or twice a really long time ago, it did work then but im too lazy to do it anymore so i just bought a cable to connect my pc to my plasma.