There are two possible solutions, either by installing VLC or Microsoft's official app, Windows DVD Player.
Option 1: VLC
I recommend this option because it is free and easy, and has always worked for me. Go to the VideoLan download website, select the version that you need and install it like any other program. Then all you have to do is insert the DVD, go to Media then the Browse button on the dialog box and select where the DVD is mounted in your file system. The video should begin to play once you click the Play button.
Option 2: Windows DVD Player
This is what Microsoft recommends to play DVDs because it integrates with their operating system, but it also costs $15. You can install it from the Windows Store by searching for it in the search box or by clicking here. After it installs all you have to do is insert the DVD and it should start playback automatically.