....or, if you have a menu along the top, click on 'help' and then 'about internet explorer'
I do not use IE myself and the post above is the only time I have come across it. No doubt this will become a regular problem as the entries for IE11 in google search would suggest. Can one revert to IE 9? - I don't know, usually one can do this sort of thing but, if possible, once done, you have to prevent it being 'updated' again, which means reviewing every update rather than letting Microsoft 'have its wicked way!'
Sorry not overly helpful. More used to hardware problems and use non-MS software where possible!!
ETA......For help reverting from current IE11, 10 etc, simply Google this:- "revert to ie9 from ie11" or even "revert to ie9" - hope that helps!