Just to point out that 4.7 is old, RHEL/Centos are on 5.3 now. If you can, I'd recommend using the latest.
You can check the repositories to see if they include the CD or not.
The GUI has an Add/Remove Software option, or you can look in /etc/yum/repos.d iirc.
You'll get the latest updated version if you use the online version, not the CD.