I just bought a Acer Aspire E5 laptop, which has Windows 8.1 and an internal DVD drive. It is a nice machine so I was startled when a DVD would not play. I could hear the disk spinning but there was no display or sound. After a lot of frustration and an online text chat with Acer support, I called and talked to a tech support person. It turns out that Windows 8.1 does not support Windows Media Player. The support person didn't at first have an answer, but she checked with other personal and was able to tell me that I could uninstall Windows Medial Player, then download and install the VLC media player app. I knew this player, as I have it on my PC, so I downloaded and installed it on my laptop, and was immediately able to play my DVD. This program is free and can be dodwnloaded at www.videolan.org.