So what part of that do you not understand? HP only supports this device in Windows up to Windows XP 32-bit. No Windows 7 and no 64-bit support.
Scanners are not one of the devices high on a companies priority list... I suspect that scanners will eventually be phased out of production within a few years.... most already have been phased out. Writing new drivers for older scanners just isn't happening by most scanner manufacturers. They are much too busy writing Win 7 and Vista and 64-bit drivers for new devices.