My advice is to install to a usb stick and forget about the iso.
When booting the CorePure64 cd/iso, choose the option "boot to text mode"
Once you have booted to text mode, you can enter commands directly. In order to load and run the Xorg-7.7 extension, you need to do this at the text mode prompt: $ tce-load -wil Xorg-7.7
$ startx