Windows Media Player cannot play DVD video. You might need to adjust your Windows display settings. Open display settings in Control Panel, and then try lowering your screen resolution and color quality settings.

Hi LoriMc,

1. Were you able to play the same DVD earlier?
2. Does it happen with a particular DVD or all of them?
3. Do you have third party DVD decoder software installed on your computer?

Step 1:
Try running Windows Media Player DVD troubleshooter and check if it helps:
a. Open the Windows Media Player DVD troubleshooter by clicking the Start button, and then clicking Control Panel.
b. In the search box, type troubleshooter, and then click

Troubleshooting. Click View all, and then click Windows Media Player DVD:

http://windows.microsoft.com/en-US/windows7/Open-the-Windows-Media-Player-DVD-troubleshooter

Play a CD or DVD in Windows Media Player:

http://windows.microsoft.com/en-us/windows7/Play-a-CD-or-DVD-in-Windows-Media-Player

Step 2:
Try updating the codecs to check if the issue persists. Also uninstall if you have any third party CD\DVD burning software installed.

Refer the below mentioned Windows help article.
Codecs: frequently asked questions:
http://windows.microsoft.com/en-US/windows7/Codecs-frequently-asked-questions

Step 3:

I would also suggest you to update the latest drivers for your display adapter from the manufacturer’s website and then check for the issue.

a. Open Device Manager by clicking on Start, then type Device Manager.‌
b. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
c. Look for the Display adapter drivers, right click on it and select ‘Update Driver’.
d. Once the drivers are installed, boot the computer and check for the issue.

Update drivers: recommended links:
http://windows.microsoft.com/en-US/windows-vista/Update-drivers-recommended-links

Step 4:
Try reducing the Hardware Acceleration.