Thanks chad. Here’s what I’m getting when I do that:
“Your input can’t be opened:
VLC is unable to open the MRL ‘dvd://D:\’. Check the log for details.”
So ... I’m at a loss. The drive plays just fine when it’s a CD.
Did you try a second DVD?
If so and if that also failed to play, start Windows Explorer and see if you can get a directory listing for a DVD disk. The "Computer" or "My Computer" icon on your desktop should start Windows Explorer. Look at drive D and see if there are files listed.
If your computer is that age it’s probably a CD player, not a DVD player. CD players will not play DVDs.