On shut down I get a window that says Continue the installation Choose abort if you wish to cancel the installation If I don't press anything or if I press Yes or Abort the message goes away and the computer shuts down.  This has been going on for ov

I have a 27" iMac mid 2011 2.7 GHz intel core i5 with OS 10.10.1.  For about the last month when I shut down I get a window that says "Continue the installation Choose abort if you wish to cancel the installation  ABORT   YES".   If I don't press anything or if I choose ABORT or Yes the message goes away and the computer shuts down.  But the next time I use the computer and then shut down the message is back.  I have looked to see if there are any downloads pending or if there are any updates trying to download.  I am very puzzled.

Genieo Adware is installed.  Removing it will help.
If you have another browser installed, use it.
If not, launch App store and get another  browser for temporary use.
Remove it afterwards.
1. Use  free  AdwareMedic by clicking “Download ” from here
    http://www.adwaremedic.com/index.php
    Install , open,  and run it by clicking “Scan for Adware” button   to remove adware.
    Once done, quit AdwareMedic by clicking AdwareMedic in the menu bar and selecting
    “Quit AdwareMedic”.
               or
    Remove the adware  manually  by following the “HowTo” from Apple.
    http://support.apple.com/en-us/HT203987
2. Safari > Preferences > Extensions
     Turn those off and relaunch Safari to test .
     Turn those on one by one and test.

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