First, rip with DVDFab HD Decrypter into ISO format (DVD Decrypter is no longer developed and doesn't deal with newer copy protections). If you install "Alcohol 52%" (freeware), all you gotta do is right click that ISO file and select "mount image", and your DVD player should open and play away. Later, you can right click the virtual drive to unmount the iso and delete if you like.
If you want a file to keep that you won't delete soon, open that iso with Fairuse Wizard and convert to avi or ogm (I am partial to ogm, which uses ogg instead of mp3 for sound, b/c sound bitrate can be set very low like to to 32 kbps but still give excellent quality).