Multi-Chaptered dvd

[OURKID]

Hi peeps
I have got a Beyblade dvd (for the kids honest lol) and when i attempted to back-up it seems to have 4 seperate chapters.
I am using dvd-decrypter to de-code the protection but it comes up with 7 pgc files of which only 4 are the film file (all about 21mins each) now how can i select all these files as unlike all the other films i have done have only had one main file, so obviously i am only getting 1 chapter at a time and if i try to do the next one it obviously wants to overwrite the previous file...i have tried moving the files to a seperate folder and re-naming the vob files but when i try writing the disc with (don't laugh ) nero it say's there is a conflict and certain files are not present.
When i de-crypt the seperate files i only get a vts.ifo file and a vob file and vts stream info file but all the files are 'named' the same.

Sorry about all the waffling but i am quite new to this and this is the first time i have come across a film with seperate chaptering like this and am totally stumped on how to do it?

\Many Thanks in advance