Sounds like permission issue. Check this link for more details.
Vista Permission Issues Vista Permission Issues. Access Is Denied when Vista
Accesses Network Share If you receive access denied, it could be the
permission issue ...
http://bobmsmvp.googlepages.com/vistapermissionissues
--
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
"Hal" <Hal@discussions.microsoft.com> wrote in message
news:16622C24-F18E-419B-93C9-7C72EBD8F634@microsoft.com...
>I have just added a new CPU running on Vista to an existing CPU with XP
> linked via a wireless router. I am able to see the XP CPU however when I
> click on the icon to access the shared folders and printers it indicates
> that
> I cannot access the CPU - (Network Error)
> Also printers on the XP CPU do not show up.
>
> Workgroup names are the same. Access rights are the same.
>
> Im at a loss on what to do next.