Mmmm...if it works on Clint's computer, why not get the files there, and then transfer them over to the one you're on? If you can't do that, try and do a reinstall of dvd decrypter on your computer.
Do you have a dvd recorder or something? Another thing, is they might have their own setup that doesn't work perfectly with computers. Friends of ours have a mini-dvd camcorder, and it can finalize the discs and they'll play fine on dvd players, but computers get tied up in knots with them. :|