The separate downloads for each always tend to see the "other options" when comparing those to the update notifications for things like reader, Flash Player, and a few others. McA(Fail) and the ask.com toolbar are the more frequent items seen with those. You know where those end up!
Here I have one other continual prompt which appears to be for Flash Player with "failed to update" popup since WaterFox is the 64bit flavor of FireFox. Yet the download for the Mozilla browsers for the open source flavor of the Flash Player seemed to have no trouble at all with the install.
Getting back to the Adobe reader required this is looking back not only in the last few years but collectively for the last decade or so when running into that frequently. On one of the old XP builds I had left Adobe out of the equation but ended up needing to back after it when the Sumatra reader was rather new at the time.
Back before the fresh 7 install in June I actually had Opera set as the default on a few things and I ended up seeing the icon for Opera on too much. FireFox 12 was on as well as Opera, the last Netscape Navigator 9, WF, and some others like Flock and Ice Weasel when having a collection of them going. Each except Netscape was set to ask each time once the Opera situation was corrected.