We have several HP ScanJet 7400c scanners attached to Dell workstations (Dimension 3000) with XP Pro. When our users try to scan they get a dialog box that looks like the attached jpg. Our users have to click on Retry every page. In doing some research, it looks like it might be that USB ports don't like sharing IRQ's and on these systems they are sharing IRQ 16. In addition, ACPI (?) will not let me manually assign an IRQ even though IRQ 22 is available after I disabled the modem (not needed).
Thoughts and help appreciated.