DVD - Enable DVD Player in Media Player

This setting allows you to use Microsoft Media Player to Play and Open DVDs
Start/Run/Regedit:
HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Player\Settings. Value Name: EnableDVDUI, Data Type: REG_SZ (String Value), Value Data: yes or no.
Create a new string value called "EnableDVDUI" and set it to "yes" to enable DVD functionality.