This guide will help you install CentOS 6 smoothly. There're some things that you should notice before starting to install CentOS 6. First, your memory must be at least 384MB (no Desktop) or 512MB (Desktop). Then you should enable PAE on your CPU. Now we start to install your Linux machine:
In this part, depend on your purpose, you could choose Desktop, Basic Server or the others.
Have fun!