I'm attempting to install Centos 6.5 and Ubuntu 13.10 via VirtualBox and I seem to be getting conflicting issues.
I first tried installing the x86_64 version, which notified me that I needed the i686 version of the kernel. A quick Google search showed another person with the same problem and the suggested course of action was to install the i386 version. This led to the message
" This kernel requires the following features not present on the CPU: pae. Unable to boot - please use a kernel appropriate for your CPU"