USB Printer Installation Problem

I have tried to install 2 brands of USB printers, the
Canon i9100 and the HP PhotoSmart 7960. In both cases
(following the directions explicitly) the pc sees the new
hardware but cannot complete the installation. I have
spent hours on the phone with tech support for both
printers. They are stumped.

The error for the HP is as follows:
Cannot Install This Hardware
There was a problem installing this hardware
photosmart 7900 Series (USBPRINT)
An error occurred during installation of the device.
The required section was not found in the INF.

I have cleaned out the drivers, unistalled the USB,
everything I can think of. I have also disabled all
startup programs. What is really perplexing about this is
that I have tried this on XP Pro, and W2000 pc's at my
office and it gets the same error###!@#@# If anyone has a
suggestion, please let me know.

Thank you for your time.
Cheryl