I issued "sudo apt-get update" and waited until the list was updated.

I then issued "sudo apt-get -t experimental install nvidia-driver nvidia-settings nvidia-xconfig nvidia-kernel-dkms", answered the question(s) with lower case 'y' (no quote marks) and got the abort message.

Restarted the machine, went through the same process but suspected that the required answer may be case-conscious so answered the question with capital 'Y' and still got the abort message. That's when I posted the problem.

The third time I followed the same procedure but just hit the enter key instead of 'y' or 'Y' and the download went ahead.

Beats me.

But anyway, it's now installed, I followed the rest of your instructions and the machine boots to desktop, but more problems have arisen:

From the desktop I was able to modify the syslinux.cfg file to fix the time variance. Clicking on the Iceweasel icon to launch the browser resulted in the machine freezing ie. desktop display remained normal but the bowser did not launch, the only thing working was mouse pointer movement, no left click or right click on anything was working. The only way out is to force a power down.