Thanks GtW and T57
NOTA, have you looked in regedit to attempt to locate that key?
And (of course) in the docs and settings folder for that file?
No, I haven't done that as yet. I'd like to get the machine home with me so I can wrap a wet towel around my head and concentrate. The neighbour is a benign sort, but I don't need him peering over my shoulder when I am trying to work my magic

What you suggest hadn't occurred to me so I'll give it a go.
As mentioned in the opening post, it's not five minutes since I did a complete re-install and I don't know what else lurks within, since his capacity to bugga it up knows no bounds. Perhaps, I should have charged him £85.
I suspect that would have concentrated his mind wonderfully and he would have been more careful thereafter.
Anyway, onward ever upward
N o t a