It is not the standard install window. I got there as a result from a popup saying that there is an update to Flash player and if I wanted to install it.
The update popup downloads an "installer.exe" that when started just installes McAfee i parallell with the Flash player.
The downloaded file is called: install_flashplayer14x32au_mssa_aaa_aih that is to be started manually.
(Download link is: http://aihdownload.adobe.com/bin/live/install_flashplayer14x32au_mssa_aaa_aih.exe)
I do not recall any opt out information in any windows, as I always check for that.
Regards
Erik
Win7 64, Firefox, Europe