vista cannot detect the devices in the network

I have problem with windows vista, i have a router an switch and some times
when i connect a computer with vista, and i use the network discover the
other computer which is running win xp dosnt show in the discovery page,
while when i view the map, all the computers come in the map, i did the xp
layer update, but with some vista computer no problem and the problem with
some.
i need your help please

http://technet.microsoft.com/en-au/library/bb727037.aspx

The above link is file and printer sharing in Vista

You will also have to run the Network wizard in XP.

Sam, you say they don't see each other. Did you make Vista and XP computers
Workgroup name the same! It has to be the same for then to be in the same
network and see each other.

"sam" wrote:

> I have problem with windows vista, i have a router an switch and some times
> when i connect a computer with vista, and i use the network discover the
> other computer which is running win xp dosnt show in the discovery page,
> while when i view the map, all the computers come in the map, i did the xp
> layer update, but with some vista computer no problem and the problem with
> some.
> i need your help please