If you change your mind after performing a minimal installation of CentOS 7 from a CD, just use yum to get the missing packages.
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sudo yum -y groupinstall "Gnome Desktop" "X Window System" "Internet Browser" "System Administration Tools" "Fonts" |
The last step is to tell systemd the default target:
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sudo ln -sf /lib/systemd/system/runlevel5.target /et c/systemd/system/default.target |
Done.