Error: Not Found

[Harry Versluijs]

When shutting down my Macbook OSX 10.9.5 an install window appears that reads:
to cancel installation click abort.
There are 2 buttons: install and abort.

I have nothing to install, had everything I don't want/need uninstalled using CleanMyMac2.

When I click abort the laptop shuts down normally and starts up normally, it does not seem to influence performance.
To make sure I used disk repair, there were some minor issues but after repair the disk appears to be ok.

When I click Install I get a window that reads:

The requested URL/agent_update?session_id=728948AO-3017-
46E3-ADES-
32E34B9E2A29&emid=8d3f15d83b4798078e89d9/ee5ce&app_id=13090011
Hans,zh-Hant,ja,es,it,ko,pt,pt-
PT,da,fi,nb,sv,ru,pl,tr,ar,th,es,hu,ca,hr,el,he,ro,sk,uk,id,ms,vi&
was not found on this server.

I made a photo of the screen, this message appears only a few seconds, then it disappears and the laptop shuts down.

Photo included in attachment.

Does any one know what this is and how to remove it?

[Harry Versluijs]

Found it. After some searching in log in items I found an icon with a box InstallerS.
First I disabled it and restarted. No message, logging out and in again went smoothly.
So I removed the item.
Simple problem maybe but I'm happy I found it.