I'm using Windows 8.1 and IE 11. Many websites show the following yellow box "this website wants to install the following add-on:'AdobeFlash Player'from 'Adobe Systems Incorporated.' The Adobe site says I don't have the latest Flash but when I try to update it says Microsoft kbxxx is already installed. My wife's PC is using Windows 8 and she has the same issue. What's up?
This is a known problem with Internet Explorer 11, which Microsoft has been aware of since October 18 when they released their latest "flagship" browser (sarcasm intended). The pages can't recognize the browser, so they don't recognize any of the plugins, like Flash Player. So far, Microsoft has made NO indication that they have any plan to fix it soon. In fact, I recently learned that THEY DID THIS INTENTIONALLY (IE's many user agent strings explained). Basically, they screwed it up ON PURPOSE and you're just supposed to live with it, because "MS knows best". Me? I don't buy that.
Microsoft's recommendation is to use Compatibility View for affected pages, and "pretend" you're using an different browser. Trouble with that is it has seen limited success at best, and you have to individually enable it for EVERY page that has problems.
I'm not big on "pretending" so I recommend actually using another browser.
ANY of those will work where IE11 won't, with the Flash Player Plug-in (For all other browsers), and Chrome doesn't even need that because it has its own Flash Player plugin built in.