I'm trying to archive some of the stuff I already have on CD-Rs to DVD-R. I know that the files I'm trying to burn work just fine on the hard drive. However, between two attempts at burning a data DVD, two files continue to not work on either disc. I burned the discs making sure not to be using any other processor or memory intensive apps at the same time. The data verification went off without a hitch. Unfortunately, every time I try to open the files from the disc, my computer just hangs. All the other files on the disc work fine, so they're not quite coasters. I can't drag the files to my hard drive without causing it to hang either. Having already wasted two discs in the attempt (I don't like partial archives), I want to know what's going wrong before I try again. Any advice?