OK,first of all do you have Automatic updates enabled?
If you have got them enabled,right click "My Computer" select properties.On the Automatic Updates tab put a tick in Turn off automatic updating.I want to update my computer manually,and then click apply.
Also look in your Startup folder on the programs menu,and if your internet connection is listed there,remove it.
Now Reboot.
If you still have the problem,post again and we'll look for another solution.