I faced this error while Runnign Edubuntu from Virtual Box.
I used this edubuntu-13.04-dvd-i386.iso file.
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up.Sign up to join this community
VirtualBox is indicating that the PAE support is not present in your computer. The following link may provide you with what you need to do to help with this situation. Virtualbox install 12.04 guest: "pae not present"