Here's what you're running into - this is already considered an "older" aio, which means HP is not going to go back and develop the full software suite for Vista.
Your choices are:
Use the Windows Fax and Scan feature that comes with Vista Business, Ultimate, and Enterprise.
http://www.microsoft.com/windows/windows-vista/features/fax-scan.aspxIf you have Vista Home or Basic, or if the Fax and Scan feature doesn't work, then essentially you are out of luck. You now have a printer, not an all-in-one.
Suggested solution - buy a new all-in-one that is fully Vista compatible.
I know that is not an answer you're going to want to hear, but that's the way it is. Manufacturers (and it is not just HP, there are plenty of others) are not going back and developing Vista drivers for past produced models. The 3380 was first manufactured in 2004, so it is considered too old to bother writing new Vista compatible software. They are using Vista compatibility as an excuse to attempt to force you to go buy a new unit.
michko