Empty Internetwindow with every start-up

Everytime when I start up my macbookpro I don't see the desktop anymore but I see this internetwindow. It is not fully loaded and in the activity window/frame it is mentioned as a frame that is not loaded.

In Windows is a function called msconfig.exe where you can find wich stuff loads as the pc starts.
Where can I find the same in Mac?
There must be a startup list where I can shut off this automatic loading of this
frame at every startup.