Win7-64 Pro - IE11 - Only 360p & 720p Available in YouTube

Hello,
I have a Windows 7-64 Pro desktop.  I normally see YouTube videos using IE11.  When YouTube switched to HTML5, only the 360p and 720p formats are available.  Before, using Flash, all formats were available:  240p, 360p, 480p, 720p, 1080p.  Not having 480p available in IE11 is especially irritating.  FireFox also uses YouTube HTML5 and all formats are available.

I would prefer to continue using IE11 for playing YouTube videos and all other videos.  I want to continue viewing videos on IE11 and browsing using FireFox.  This makes for smoother video playback and more stable browsing.  Using IE11, I don't have any problems playing Flash videos on other websites and Microsoft Silverlight on Amazon Video.  I have not done any Windows Updates for awhile.  Is this the reason why 480p and 1080p are not available?  I know I am posting this a bit prematurely.  I need to spend a day reading and sifting through the Windows Updates for our 3 Windows 7 PC's here.

If the Windows Updates do not fix this problem, will installing the CODEC package fix the problem?  I have delayed installing the CODEC package because I want Windows Media Player to remain as my default AVI, MP4 and MOV player.  I also want CyberLink PowerDVD to be my default DVD and Blu-Ray player.  In addition, I don't want any player changes for the audio formats either.

By default IE11 only supports MP4 format with H.264 video. YouTube uses WebM format with VP9 video for the high resolutions. This codec gives the ability to play that:
http://www.webmproject.org/ie/

The codec pack does not have any effect of video playback in the browsers. But you can still use it to extend the playback capabilities of WMP. At the beginning of the installation you can select your preferred video player (WMP). By default, it won't change your existing file association for audio files. It only adds new ones for formats that you were previously unable to play. The default DVD and Bluray player also stay as they are.

Admin wrote:By default IE11 only supports MP4 format with H.264 video. YouTube uses WebM format with VP9 video for the high resolutions. This codec gives the ability to play that:
http://www.webmproject.org/ie/

Hello,
After doing 100 Windows Updates, Flash, Shockwave, QuickTime and FireFox updates, I finally installed WebM in Windows 7-64 for IE11.  However, there was no change.  I still only get the 360p and 720p options in the YouTube HTML5 player.  I do not get the 480p and 1080p options.  Are there any settings I need to change or any additional downloads I need to install?  If not, it may be that IE11 in Win7 does not support Media Source Extensions.  If there is nothing I can do, I'll go ahead and uninstall WebM and do a System Restore.  I created a Restore Point right before installing.

I was able to get the 480p and 1080p options by using Flash.  You can still use Flash in IE11 on YouTube by adding the &nohtml5=1 suffix to (hopefully) any YouTube URL.  I would prefer to use HTML5 because it is more reliable and it has the preview feature when you hover the mouse cursor along the video slider.  Flash does not seem to have preview.  If I cannot play YouTube videos at 480p or 1080p, I will be forced to use Flash.

You do not need to use system restore after uninstalling a piece of software! It is the job of the uninstaller to remove things. Frequent use of system restore can actually do harm to the stability of your system, because it does not backup/restore everything but only specific types of files and settings. This can eventually result in things becoming a mess. You should only use it in case of an actual problem.

I have IE10 so I can't test it, but that WebM plugin should just work with default settings.