Please don't post the same question in different threads vzap. It causes confusion as to where to post an answer.
I've deleted your other post in the old thread you found on AVI2DVD.
First thing is to check your original files. Do they play all the way through without problems?
Second step is to use a good conversion program. I recommend AVS2DVD: http://www.videohelp.com/tools/AVStoDVD Use the HC encoder within it.
If you want to use a commercial program, look at ConvertXtoDVD.