Switch To ... Retry...Error while scanning

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.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

There's a known incompatibility between this scanner and Dell Dimension Desktop computers. See these HP articles:
HP Digital Imaging -  Known Incompatibilities with HP Scanjet Scanners using USB Connections


HP Scanjet Scanners -  'An Unexpected Internal Error Has Occurred' Error Message While Scanning

kevin1000Author Commented:
Thanks.  I've been looking at those documents.  Do you think there is a work-around ...usb hub etc?
Earlier in one of the documents, "Dell recommends purchasing a powered USB hub to provide the USB devices with enough power to operate correctly. Using an available USB port from a USB keyboard can worsen this problem."

So, yeah, I'd try a USB hub. :-)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.