The link Mr. Nfo gave is decent, but one thing you'll need to worry about copying Ninja Gaiden is that the game is DVD-9. You'll need to delete all the japanese versions of the cutscenes (or english ones if you are so inclined) in order to fit on a normal DVD-R. If you get as far as ripping the files off the disk onto your PC, reply here and I'll dig out my disk to tell you which folder in the Ninja Gaiden directory has the movies you need to delete...