You could try sharing the DVD drive of your PC over your network and try it from there. I wouldn't like to guarantee that it'd work though. Even if it does work, play back might be a little jumpy (especially if it's a wireless network).
If it doesn't do the trick, a laptop DVD drive is easy to replace. On a lot of laptops, it's just a case of removing one screw and it'll pull straight out. On others, you have to remove the cover on the back (just unscrew it and it'll clip out) to get at the screw that holds the drive in but that's still easy peasy.