Can see additional network

In my DHCP I have an additional route added to everyone who get an IP
address handed out by the DHCP. Everyone is able to see the network segement
they are on along with the new sgement that I added via the route using
DHCP. I should say everyone EXCEPT any Vista users on our network. Does
anyone know if I have to do something special on the Vista PCs to get them
to communication with this new network segement. By the way when I do a
Route Print I can see that the addition route was added to all the Vista PCs
just when I ping I get no response back from anything on that segement.

Steve