Hi Lawrence,

OK, with luck, I will now be barking up the right tree.
I assumed the problem had nothing to do with installing.
Looks as if I was wrong about that. I will direct my
investigations accordingly.

"... Of course the problem now is that some directories
contain no longer valid information - such as the new drive
with A2 on it. Could now do with a simplified method of
changing this!"

True enough. And, of course, an issue not limited to
Vista (or even A2.0; one should also be able to set the
location for UCAC-2 and some similar datasets.)

-- Bill