Installing from the DVD goes fine. Files copy, start menu items are created, game asks me if I want to launch, children rejoice and then...
It tells me to insert the game in the DVD drive. It's definitely in there. I've ejected and reinserted just to make sure several times. Rebooted too. Again, nothing.
Opening Windows Explorer now tells me that there's nothing in there. Autorun/play doesn't come up when I drop the disc in.
There's a whole lot of nothing going on.
Other discs load in the drive fine, for now.