Unwanted Itunes & Quicktime in system tray

When I start my computer, both of these programs show up in the lower right hand part of the screen along with other programs that I do want to start when the computer does (Norton, ZA, etc.) and I see no reason for them to be using system resources especially when I may or may not use them during the session.

However they are really buried somewhere. How does one keep them from starting at bootup? TIA
 
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