We are volunteers willing to help you try to resolve this issue.
Support for a Printer/Scanner comes directly from its hardware maker and the producer of the drivers, Windows is really just the shell.
The ScanJet 5370C is not Windows 8/8.1 or 10 compliant so you will need to work with HP Support and Forums. Possibly there is a 3rd party solution such as VueScan however those are not free. BTW this product was also not supported on Windows 7.
HP Support/Troubleshooting & Drivers
http://www8.hp.com/us/en/drivers.html
Contact HP
http://welcome.hp.com/country/us/en/contact_us....
HP Forums
http://h30434.www3.hp.com/psg/
Please let us know the results and if you need further assistance.