well, most of them are appliets that run from the run key in the registry.
Look through those items and see what you find. anything you don't feel like using, just delete the key. But remember, always make a save first,ie, export the key your going to work in and save it somewhere incase you made a mistake.
Also, look in your startup folders.
MSCONFIG will get you to them, but doens't remove them. This way you can remove them.