During the installer the user will be asked if they want to install McAfee anti-virus. There is a checkbox on the page in the setup that is already set to true by the time they get to it, so most users will probably think that having "more protection" is a good thing and that Adobe is really looking out for them.
At one point, there wasn't even a checkbox in the installer as I recall - there was some kind of checkbox on the page to download the installer, and if you didn't notice and uncheck it you got a download that installed whatever crap they were pushing silently and automatically along with Flash.
Not to mention a larger, longer download. Then you realize it and have to re-download it all over for the flash-only one. (It's happened to me a few times.)
