Windows 7 - playing DVDs
I slotted in the disk, fired up Windows Media Player and bam:
"Windows Media Player cannot play this DVD because there is a problem with the digital copy protection between your DVD drive, decoder, and video card. Try installing an updated driver for your video card."
Hmph. Strange. A bit of rummaging suggests that the problem is related to Windows 7 not working with DVD-ROM drives that don't have region encoding (which should mean you can play a DVD from any region).
It's a bit of a bummer, but you can use VLC Media Player. Or alternatively use a program like DVD Shrink that will remove the copy protection from your DVD (and the added bonus of removing adverts, trailers, menus and other crap that really aren't required for a film).