There are two things, the file format of a disk, DVD,MP4, WMP.
Depends on what format, depends on whether windows media player can read it.
Im guessing you only have windows media player.
There is also a country code, some are set to another country, but this is probably not the issue.
You can open the disk, that i, when you have the disk in, go to my computer, you will see the dvd drive, could be drive letter (D)
you right click on the drive and in the little window you will see
auto play, open, explore, share, and so on.
You can either open or explore, you can copy the files to a folder on your computer, then use a converter to change them to WMA WMV,
You can go to google.com and search free dvd converter, and you will see a few.
Here is one that is safe.
http://download.cnet.com/Digital-Media-Converter-Pro/3000-2194_4-10372005.htmlIf you have anymore questions, just post back.