If your System Event Log contains an Event ID 7024:
The Messenger service terminated with service-specific error 2105.
net helpmsg 2105, you receive:
A network resource shortage occurred.
The network hardware could not access the resources it needed.
Try the command again later.
Use Control Panel / Network / Services to Add the NetBIOS Interface. If it is already present, remove all protocols and re-add them.
Re-apply your latest service pack.