Download and unzip latest version of
Process Explorer from SysInternals (now owned by Microsoft). Run the executable. There's a row of icons, just below the top row of pull down menus.
Select (left-click and hold down mouse button) the "
gunsight" icon from the far end of icon row,
drag it onto the annoying popup window, and
release the mouse selection button. The process controlling the popup should be
highlighted in Process Explorer window.
What is the
name of the process controlling the popup?