This is one of the easiest areas to clean up. Just go to Start - Programs - Startup and then you can right-click and delete the unwanted programs. Keep in mind, this won't delete the program, just the shortcut that's trying to start the program. You can always manually start it later. If you're not sure if you really want to get rid of it, just cut it out of there (Right Click - Cut), and paste (Right Click - Paste) the shortcut to a temporary folder somewhere (like the desktop), then if you want it back, it's easily accessible to put back.