Noel,
Victory at last! Many thanks.
After a couple of other false starts I managed to get the right spaces where needed. I had indeed missed the one between cd % and finally right at the end between vbs -rilc.
I finally got the desired message : License files reinstalled successfully.
The first time I restarted I got the validation box but no telephone option, so I entered the product keyand voila activation was confirmed. I closed down the computer a second time as instructed. On restarting The black screen came up but the message about this copy of Vista not being genuine had disappeared. I have now replaced the black with a more colourful background.
So your instructions were fine - it was just that I am not familiar with the computer commands and was in new territory and made some elementary mistakes.
One question : when I selected Yes in Step 5 did I remove anything important which needs replacing?