Hi,
I actually referred to the Deskjet 6988 only as I was confused by the title ;-)
For the Scanjet G3110 you do have a full solution available.
If the scanner is already conneted to your PC, be sure to open Devices and Printers, right click the Scanjet 3110 and select Remove Device.
Unplug the USB and install the following software:
I'm not surwe if the HP Solution Center will be available as well or may the HP Scanning software only, however the front panel copy button will woirk once the software will be intalled.
Regards,
Shlomi