Have a look at Control Panel>Network>Identification Tab
Be sure the Computer Name and Workgroup are correct.
To see what it says in the registry go here:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VNETSUP
In the right pane there should be two String Names.
ComputerName
and
Workgroup
Be sure the Computer Name and Workgroup are correct.
To see what it says in the registry go here:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VNETSUP
In the right pane there should be two String Names.
ComputerName
and
Workgroup