Doug,
We had some issues with Print Drivers from HP and we found that the Vista
drivers will work in some cases. For one of our printers, we tried the
drivers for a different model in the same series and they also worked.
You may want to try some of these drives to see if you have any luck.
We are running WF4 M140 64-bit on Windows 7 Professional 64-bit with no
issues. I am upgrading next week to Wildfire 5 64-bit.
Good Luck
Damián Castillo
CAD & Administration Manager
Engineering Department
Hensley Industries