if your not going to buy key for office i would uninstall. you can get readers from microsoft for powerpoint and others from microsoft for free.
adobe reader i would keep. if its starting up in the system tray when turned on i would goto start , run , 'msconfig'. startup tab and turn off adobe reader. you can start manually when ya want to use it. everything else i would likely leave alone. if ya take off norton which i would you can get avg free for the virus that works well. ya need something.