Operating System: Windows 95 & Windows 98 (Note: might work with other versions of this os.)
Download from the HP site, it is big, 17,26 Mb. But it works fine. I have tested with Windows 98 and ME. When you unzip, it will be installed in c \Windows\temp. Execute the file c \Windows\temp\DISK1\setup.exe, the installation is automatic. Then, after restart you need to update with sj585en.exe for Win ME. This file is too in the HP site. Don't go to the Control Panel or Add Programs or Add Hardware, it is not necessary. The program fix all automatically. An other thing, the scanner 5100c is very good, 12-1200 dpi!!!