The first step was to download the driver from the Nvidia website:
Make sure that the file is executable:
$ chmod 755 NVIDIA-Linux-x86_64-302.07.runBefore running the desktop environment needed to be stopped:
$ sudo stop lightdmThen using Ctrl + Alt + F6 to get to another command prompt I ran the file as root:
$ sudo sh NVIDIA-Linux-x86_64-302.07.runThe installer was able to detect that I had dropped back to the Nouveau driver and gave an option to disable it on next reboot. I agreed to this option then rebooted using:
$ sudo shutdown -r nowThis time the system had booted up without the Nvidia or Nouveau drivers so I repeated the steps to stop the graphical environment and run the installer again. On completion I was able to reboot my system into what is now, once again, a stable system.