Hi Friedrich

I was afraid that was going to be the answer. I have a reasonable
understanding of UAC and the protected folders and have several
successful installers being used every day on a variety of OS from Win98
to Server2008, but this is a really stupid situation affecting an old
system we have been running since 1990 in various incarnations.

The target OS is XP, and this is a large corporate customer with limited
user access implemented via domain policies. One of the stupid little
things they do is to NOT show the "All users" desktop icons on
individual user desktops. The installation is indeed a per-machine
installation as the data is kept on a server (IP Driver).

Oh well, time to bite the bullet.

Thanks & regards

Daan