They would be slowing things up as they are all running, admitadly at a tickover but it all adds up.
To disable startup items goto START RUN and type MSCONFIG the last tab is startup from here you can disable what you like by unticking the boxes.
Be warned. Only untick the boxes you can identify as things you don't need as some of the items are needed for windows. Disable the wrong one and windows won't load and run.
Its not as bad as it sounds as if you do this what you do is start in safe mode and retick the boxes. So what I am saying is write down what you disable so that if things do muck up you can tetick the relevant boxes.