How do I shrink the Video Picture Size with TMPGEnc to fit on my TV Screen??

Well basically, when I convert an AVI to dvd or mpeg to make a dvd out of the picture is too big for the screen. I am trying to make anime DVD's but it cuts of a TON of the picture, including the subtitles. I used to use WinAvi Video Converter, but that doesn't work with Vista. That program would let you shrink a percentage of the actual video size, to be smaller and fit on screen. Does anyone know how I can shrink the video picture size and what a good size would be? If you could give me numbers for both 4:3 and 16:9 that would be great! Thanks