🚀 go-pugleaf

A problem I "used" to have, or shall I say - a problem that occurred at low
enough frequency that I did not let it bother me, has made a comeback but
this time it is doing it practically all the time - irrespective of whether
I am scanning 1 35mm slide or several.
Googling reveals other people have suffered similar problems but
unfortunately no hard and fast answers.
The problem is simply that when I use my Coolscan V ED to import into
Photoshop Elements 2 (***now using Elements 3 - same problems***) I need to 
close the Nikon Scan window(version
4.0.2)before I can edit the photos using Photoshop. When I do this, however,
it tends to close Photoshop as well and I lose all my scanned images in the
process and have to start again. It is doing this 9 times out of 10 - which
is clearly unworkable.
Things I have checked...
Driver file "scsiscan.sys" is present in the Windows/System32/Drivers file
where I believe it should be (some noise on the web suggesting this can be
an issue as can be deleted/moved when installing printers - I have never
installed a printer to this p.c. anyway).
Tried setting Photoshop to work in Windows 2000 compatibility mode (another
suggestion by someone)- no difference.
Tried removing NikonMonitor application from start-up programs (I do not use
a Nikon digital camera and all this application does as far as I am aware is
look out for a camera connection) - no difference.
My OS is WinXP Home Edition SP2...
The ONLY thing that has changed with my p.c. environment in recent weeks has
been the installation of a new motherboard (identical spec to previous)-
again I cannot see what difference that would make (yes, it did make a
difference with my Norton Antivirus and Microsoft Reader software - they had
to be re-registered due to the fact, I found later, that they record very
detailed hardware logs within their DRM processes - they had assumed I had
tried to install them on a new p.c. - that is another headache/topic of
discussion altogether).

Is my problem with Photoshop/NikonScan a memory management issue? - Pretty
certain it is not - I am running 1Gb RAM and a typical 35mm slide scan at
8bits is around 30MB file size.

I NEED to find an answer for this one!