HP DeskJet 400 PrintSmart Driver
Download and install the HP DeskJet 400 PrintSmart driver for Windows 3.x/95. This driver supports the DeskJet 400 printer in Windows 3.x and Windows 95. It features improvements in overall performance coupled with the Windows 95 look and feel. After downloading, extract the contents to a temporary directory by typing the filename with the “-d” switch.