Converting a Red Hat PC to CentOS

I need, experts in the house. I had this Windows 8 HP desktop that i converted to a red hat enterprise server. I then noticed that Red hat required paid subscription to do so many things. So i now decides to put d pc on CentOS. The problem is that the system refuses to boot from the CentOS iso cd so i can install CentOS. Any help pls?
ptoall1000Asked:
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Zephyr ICTCloud ArchitectCommented:
Maybe it has something to do with Secure Boot or UEFI, can you disable Secure Boot in the BIOS of your desktop?
gheistCommented:
You can convert in place:
https://wiki.centos.org/HowTos/MigrationGuide
Or choose Oracle Linux that has +1 in each package number and will reinstall all.
ptoall1000Author Commented:
Been a newbie, i found it much easier to get a fresh Centos installation instead of the conversion. I actually had problem of slow internet speed before, so when i had a faster internet i downloaded Centos iso and installed it afresh. I did not follow ghesit advise, however, i really appreciate the contributions. I m ok now with a fresh installation.

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ptoall1000Author Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for ptoall1000's comment #a40786967

for the following reason:

I found it easier.
ptoall1000Author Commented:
I found it easier to install a fresh centos iso, i felt the conversion was getting more difficult.
gheistCommented:
Fine for me... Conversion was worth the complexity if you had some data (or as intelectual excersise)
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