When you find the extension causing the problem, click Remove. When you find that YouTube videos aren't playing on your computer or mobile device, there can be a handful of different factors at play. At the top left, click Reload . Updating Important Software: Since playback errors can be caused by unidentified bugs or errors, … If the video or game doesn't work, you can turn your extensions back on and clear your browsing data. Go to the site with the video or game. Using other media applications to play videos If you're using other media playing applications with Internet Explorer to play online videos, you may have to go to that manufacturer’s website and make sure that you have the latest version of that application and any necessary add-ons that are required for Internet Explorer 9. Videos that won't play, even though the YouTube site loads just fine, may be too large for your internet connection to stream. If the video or game plays, try the next extension.