Are you using a physical DVD or an image from your hard drive? If it's from the physical drive, DVDs have different tracks according to the origin, and DVD drives can only switch back and forth between these different regions only a couple of times. Once you have spent the switches, it keeps the last one and you cannot switch back again.
Each DVD drive comes with a player, you can't read it directly from VLC or Media Player Classic. So even if it's an image, maybe you can get some DVD players from download.com, such as
Easy DVD Player.
It may also be a codec problem, you should try and get the latest codecs from
codecguide.com, the K-lite pack has a bunch of codecs that may solve your problem.
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