I use windows XP. After I burn files to DVD disc using Nero 8, (after successfull completion), the drive shows 0 files. When I restart the computer the files in the DVD drive are properly displayed.
Built in DRM on newer DVD drives for PCs create many of these problems. Try loading a CD (not a DVD) with burned files, open it up in Explorer, then replace the CD with the burned DVD. This usually works (I have to do this with my DVD archives of MP3 files) and is easier than constantly rebooting. Loading the CD first removes the DRM restrictions on the drive that are more restrictive on DVDs.