DVD won't Play

This is mainly because Windows has dropped its support to provide Windows Media Player's built-in DVD codec for Windows 10 and above. To a large extent, Microsoft sees that the market is decreasing needs for a DVD drive, not to mention DVD playback service. They take it for granted that not many users may spend extra money for DVD playback since users could easily watch movies from the internet. In addition, Microsoft does not feel like paying a licensing fee to include DVD codec in the operating system.
Apart from that, Windows Media Player not playing DVD can be caused by player crashing troubles. It is possible to solve the Windows Media Player DVD not working problems in order to keep going with the Windows Media Player play DVD performance.

You can check the guide for help in the source article.

Source article: (Solved) Windows Media Player Won't Play DVD

Windows Media Player is a video player and not a DVD player, not to mention playing protected DVD. So you need to get a DVD player program to open and play DVD. Here are some free DVD programs for you:

1. Leawo Blu-ray Player
It is a free DVD player software for you to play DVD on Windows 8/7/8.1/10 for free. This DVD player software freeware offers lifelong free service for playing DVD discs, DVD folders, DVD ISO files and IFO files on Windows.

2. UM Player
As a free multimedia player, it builds in over 270 video and audio codecs so you can handle nearly all media formats, including DVD, AAC, AC3, ASF, AVI, DIVX, FLV, H.263, Matroska, MOV, MP3, MP4, MPEG, OGG, QT, RealMedia, VOB, Vorbis, WAV, WMA, WMV, XVID and many more.

3. VLC
This is a highly recommended software programs that has received a lot of positive reviews and it's also a good DVD player.

If i understood you right you need a DVD player program. If so i would recommend you to try VLC Media Player.. VLC is a portable multimedia player, encoder, and streamer supporting many audio and video codecs and file formats as well as DVDs, VCDs, and various streaming protocols..

Download link: http://www.videolan.org/mirror-geo.php?file=vlc/0.9.8a/win32/vlc-0.9.8a-win32.exe