Installation of RHEL 6.2 Server

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http://www.linuxquestions.org – Hi all, I am newbee to Linux. I wanted to install Redhat Enterprise Linux 6.2. I could not install it normally. So first i installed with basic video driver. After the installation and restart of system i was logged in in CLI mode. I cant go to GUI mode. Later i realised that startx was not installed properly. I tried ways to install startx but failed in all attempts. I tried installing desktop version instead of basic server. Now I want to upgrade it to Basic Server version. Please tell me how to upgrade? I have been searching many articles in online. but no such problem is posted anywhere. (HowTos)