Here is HP's official reaction:
We are sorry to inform you that there will be no Windows Vista printer driver available for your HP product. Therefore your product will not work with Windows Vista.
If you are using the Windows Vista operating system on your computer, please consider upgrading to a newer HP product that is supported on Windows Vista.
HP has numerous products on the market that support Windows Vista:
http://www.hp.com/united-states/tradein/home_flash.htmlThis is happening a lot with older printers, especially the low-cost ones. Considering what you pay for them, it is not considered worthwhile to spend money on developing new drivers.