Several installation options are available. Two main install options are "Install" and "Upgrade". "Install" allows you to install a plain new RedHat linux with the removal of any data and previous installation. "Upgrade" allows you to make your old RedHat installation (e.g. RedHat 7.0, RedHat 6.2, and so on) to the latest RedHat 7.1.
In "Install" option, you are allowed to fine tune your installation by selecting "Server system", "Workstation", "Laptop", and "Custom system". For most cases, use " Install" and "Workstation" for desktop PC and "Install" and "Laptop" for notebook.