Found the solution. https://answers.microsoft.com/en-us/windows/forum/all/how-to-delete-duplicate-system-tray-icon-list-from/8790797a-ccb2-43d8-bacb-a5bfc3d7e399?page=2
See the last entry by Charmaine.Kavanagh
"I found a resolve.
Navigate HKEY_CURRENT_USER\Control Panel\NotifyIconSettings...
I have the same issue - duplicate icons in system tray Started when I went to update HWINFO but the install aborted saying access denied. I uninstalled and deleted the hwinfo directories in program files and reinstalled. The reinstalled worked not but I have duplicate HWINFO system icon...