Konica Minolta Di351

When I tried to install this driver (Di351) on my Vista64. First, I found the driver is not available on the manufacture's site, instead they said the driver is included in the box with the Windows Vista64, so I look on my computer, but I don't know where do I need to look?
I you know the easiest way to find out and install it, I appreciate you.
Thanks in advance for your input,