The scanner is a Screen DT-S1030ai. It needs a special plugin folder called PS Preferences that is apparently only present in version 2 of PS. Version 3 and onwards don't have that folder, according to my friend who is working on it. He has tried all the different possibilities in terms of cables, OS etc, and it seems that Photoshop 2 is now the only avenue for success.

Regards,
dorff