I have my very very odl HP SJ5P scanner scsi connected working fine
under VISTA -- VISTA found it and the Apaptec 19160 scsi controller it
is attached to. Both appear in Device Manager with no flags but I could
not scan.
I then did what I did in W2K and XP and installed the old HP Deskscan
2.9 software and bingo it is up and running.
I suggest you try this and don't always believe the manufacturers when
they tell you their product does not work!