IE 11 problem viewing specific videos

Thanks for posting the solution.

Are these the folders that you renamed/removed:
C:\Users\username\AppData\Local\Microsoft\Internet Explorer
C:\Users\username\AppData\LocalLow\Microsoft\Internet Explorer
C:\Users\username\AppData\Roaming\Microsoft\Internet Explorer

If so, then a minor word of warning to those that might find this thread via Google:
C:\Users\username\AppData\Roaming\Microsoft\Internet Explorer contains the Quick Launch folder/shortcuts for the task bar. By default, these shortcuts are not shown in Windows 7 and above. If you are the kind of person that uses/shows them, then you probably know how to recreate them

Yes, those of the directories I renamed and then deleted! I knew I would have to re-create the Quick Launch information but that's very easy to do.