How can I uninstall CentOS from vmware workstation 7?

Hi,
I am a beginner in Oracle 11g course and I have installed Cent OS 4.8 i386 on vmware wk-7 for unix hands-on, but unfortunately ended up in improper installation. My host operating system is Windows XP. Now, I would like to uninstall CentOs from vmware and install RHEL4 instead. Please suggest me a step by step procedure on how to uninstall it as I will be installing Oracle 11.2.0 after I finish installing Linux successfully. OR Is it that if one wants to remove an OS from vmware, then the vmware itself be uninstalled? If so, please advice me the procedural steps on doing so.
Thank you in advance!

Why bother to uninstall? Simply delete your CentOS virtual machine and create an new one. To delete a virtual machine from the host computer, hover your mouse to the virtual machine name in the vmware favorites list, right-click and select "delete form disk". Then create a new virtual machine.
There is no technical difference between CentOS and RHEL or Oracle Linux. Why bother with RHEL 4 or CentOS 4.8? Why don't you install Oracle Linux 5 instead? You can download it from http://edelivery.oracle.com/linux for free. Then mount the downloaded .iso image and have vmware start form it. After installing the OS, setup public yum following instructions at http://public-yum.oracle.com/. Then install "yum install oracle-validated" to install all prerequisite packages for Oracle 11g and continue installing Oracle 11gR2.

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