Well good luck to you Heather. What are you using for decryption? AnyDVD HD is very well regarded for that part, and MakeMKV is free to use while in beta. But you apparently already have a decrypter of some sort before feeding the movie into DVDRanger CinEx.
My advice is to use equipment that doesn't obey the Cinavia signal. Since you have already purchased the DVDRanger program, that advice comes a bit late I'm afraid, but playing movies in mkv or mp4 format from usb sticks, or from external hard drives works with many modern Blu-ray players. And dedicated media players, like the Roku or Western Digital TV Live ignore Cinavia entirely.