DVD Playback in BioExplorer requires an audio and video decoder.  To find out if you already have decoders installed on your computer, in BioExplorer choose Preferences from the BioExplorer menu, and select the DVD Decoders tab.

If you require decoders, they are included with several DVD player applications (e.g. WinDVD, PowerDVD, etc).  Low-cost decoder "packs" are also available from the providers below: 

InterVideo: DVD XPack for Windows XP
CyberLink: PowerDVD SE for Windows XP
Sonic Solutions: CinePlayer DVD Decoder