Many folk use drag to DVD recording software. Later they reinstall the OS but forget to reinstall said software. Vista does not know what to do with such media so the options are easy:
1. Install the software that provided said drag to DVD.
2. Research ISOBUSTER.
Bob
I have a computer with windows vista, I saved some pictures on a DVD last year. I did a recovery on my hard drive and re-intalled windows vista on my computer; since then my DVD room works fine except when I'm trying to read previously recorded files on DVDs. I can read the files in other computers but I cannot do it on this one after reinstalling Windows vista..
Anyone knows the solution?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic