regla

Hi
I am using a pre-installed Vista-PC in a Home-Network. Indirectly I am using
diverse printers, and everything goes well.
Only: on the vista-machine, I cannot print A3-paper, but only A4 and smaller.
From all the other computer in the network it works well. They are alle
running on XP. Direct connection of the printer to the vista-computer does
not give a better result.
HP support says it must be a vista-problem, as they offer a vista-driver,
which is preinstalled on my machine.
Any ideas available?
Thanks, regula