What program are you using to play it with on your PC? Windows media player can not play DVDs out of the box because it lacks an mpeg2 decoder. Try VLC, it's free.
http://www.videolan.org/vlc/
you could also drop one of the vobs into the container area in gspot and get better information about what the disc really is.
http://www.free-codecs.com/download/GSpot.htm
and BTW this is the correct forum.
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