I have vista home premium and have the same problem. I can print but I cannot scan and HP support has not been able to get it to work. My sense id that HP has not got their act together. I have a photosmart 3210.
I have New Vista loaded PC coming and wanted to know if anyone has had any luck with vista and any particular networked all in one. I have a PSC 3300 but it seems that it is not on the Hardware Compatible list. Any success and model numbers would be appreciated.