I have tried several things to correct this problem: shutting down EN, unpinning, rebooting, repinning pinning from the start menu pinning from the then-running, duplicate icon rebuilding the icon cache (see this EN forum thread, last post, from 2013)Around the web, I've seen that other apps, including iTunes and Skype, can have this problem when installing on Windows 10. But not all apps have this problem. This page describes why we might be seeing duplicate icons. It also says a bit about how Win 7, 8, and 10 store taskbar icons: http://www.ghacks.net/2015/08/04/fix-duplicate-icon-issues-