Random apps keep installing by themselves?

http://forums.androidcentral.com/general-help-how/365217-random-apps-keep-installing-themselves.html

https://www.ifixit.com/Answers/View/283063/My+phone+keeps+installing+apps+by+it+self,+what+to+do

http://innov8tiv.com/fix-random-apps-keep-installing/

http://www.droidforums.net/threads/phone-auto-downloading-random-apps.242610/

http://www.theandroidportal.com/prevent-automatic-unwanted-downloads-apps-android/

http://www.isunshare.com/android/prevent-apps-from-installing-and-uninstalling-on-android.html