Vista - microsoft vista networking

we have 25 clients are connected to our server.all clients are
proffessional,me etc..
there is no networking problem here.now i installed 4 clients into xp
vista.in the morning time there is no problem, after noon there is no network
and internet.
my pc vista had 1gb memory, all the 4 clients are facing the same
problem,others are ok at all time .ip address and other configurations are
ok.
so please give me a correct solution.

When they don't access the internet, what's the result of nslookup? Post it back here may help.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
"compland" <compland@discussions.microsoft.com> wrote in message news:A181570E-3FD0-4BCF-A641-8A0FF18FE14C@microsoft.com...
we have 25 clients are connected to our server.all clients are
proffessional,me etc..
there is no networking problem here.now i installed 4 clients into xp
vista.in the morning time there is no problem, after noon there is no network
and internet.
my pc vista had 1gb memory, all the 4 clients are facing the same
problem,others are ok at all time .ip address and other configurations are
ok.
so please give me a correct solution.