Have a look at this document which would seem to apply to your printer
as well:
This HP document says what you can and cannot do with the G85
under VISTA with printrs for which there are not fully featured
drivers:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00808543&lc=en&cc=
us&dlc=en&product=60399&lang=en
The Home versions of VISTA do not include the Fax & Scan utility that
is in the Business versions and higher so you are dependent on third
party software including from the AIO manufacturer.
But there does seem to be fully featured VISTA software for your AIO:
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2093&lc=en&cc=us&dlc
=en&product=3192753&lang=en
HP Photosmart Full Feature Software and Drivers 10-2007 9.0.0 - 154.09M
Note the diagnostic Utility as well.
Uninstall any HP AIO software you may see in Add Remove Programs,
delete any icons in the Control Panel / Printers and Fax/Scan folders;
unplug the USB cable from the PC end; reboot the PC.
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NOTE -- the following instructions are the one I use but they differ
from the literal wording of the HP instructions. I prefer to download
in case I need it again and so that I can use Run as Administrator.
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Download that HP Software to a known location on your hard drive (use
Save, not Run if you are asked) and then with the USB cable still
disconnected install the software as follows:
Locate the exe file you have downloaded -- PS_AIO_NonNetwork_ENU.exe;
right mouse click on it and select Run as Administrator and OK your way
out and the installation should start.
Do not connect the USB cable until you are told to or until you reach
Finish.
Hope for the best -- let us know what happens.