U usasma Microsoft MVP Joined Feb 20, 2012 Posts 2,104 Dec 18, 2012 #1 My system persisted in showing a green screen whenever I tried to play most videos. I tried all the tricks on the web. Interestingly, I didn't have a way to "disable hardware acceleration" when I right clicked on the videos So, while trying to uninstall/reinstall my video drivers I figured that I'd check the videos again. Once the ATI drivers were removed (uninstalled), the "disable hardware acceleration" thing came back. I unchecked it and my videos are working again!!! I hope that this tip will help others that are experiencing the same problem.