Hp 7900 Printer and MX6431 vista laptop?

As the title shows Im having an issue trying to use my printer. I ran
the vista upgrade and can see the other computer on the network, however
even though I see the printer on the network I cant get vista to
install it. I went to HP's site and downloaded the vista driver but
still cant get it to install. Is there another way via Vista to install
the drivers or access the printer via the other computer?
The other computer has XP on it, if that makes a diffrence.
Thanks for the help
docfl