I had this problem also, for some reason the file doesn't close out. I found out by going to your incompete folder and clicking on the file in question that in most cases it played and was complete enough to convert. I used my VideoWave 5 Power Edition, ( I hate Roxio but this works better then the newer versions), and edited it as an AVI or MPEG file then using Nero burned it as a DVD. Since I bought a Dell XPS Gen 5 running XP Service Pack 2 this problem hasen't came up (YET). When it did I was using a Dell Dimension 8100 running ME.
PS: Files that could be converted always ened in the credits so you don't miss anything.