Hit your Start/Windows button in the bottom left hand side of the screen and then type "msconfig"
A box should open with 5 tabs on the top. The fourth one is "startup." Under that, there will be a list of every program that starts with your computer.
I usually disable almost everything. Application like Java will run an update checker application, Itunes installs a few services, such as ipod connectivity checker and other applications install multiple startup processes. Expand the application location and look at the installation path for more information about the application if the name doesn't mean much to you.