I have been trying for at least a month to back up some divx and mpeg files along with downloaded application program to DVDr's. Nero and Prassi won't work at all they both give an error message after about 1 minute into the burn. I recently used Vob Instant to backup these files and it completed the burn "successfully." I tried to access the files after it finished and it worked fine but later that day when I tried to access the files the dvd writer (pioneer DVR-A04) didn't recognize the disc. What is going on here???