How do I stop Orb from automatically launching when I start my PC?

To prevent Orb from automatically running when you start your PC, disable the launch of Orb at Windows startup as follows: click the Orb tray icon > Configuration > More info (or Advanced, depending on your Orb version) > uncheck Start Orb when Windows starts.

Note: if you disable this function, be aware that you cannot remotely start Orb on your home PC through Orb's Web interface: thus you will need to use some remote access software (i.e., VNC, etc.) to be able to start Orb remotely when away from your PC, if you wish to access and stream the Media on your PC via Orb.