When accessing any file share or network resouce this error comes up
Steps to isoliate:
Confirm that no shares can be accessed.
Confirm that you can ping the server by name and or ip address.
Install Clirnt for Microsoft Networks on the network card or wireless card that is used to connect to the network
Steps: Open control panel > Network and Internet > Network Connections
Right click on the network adapater go to properties.
Click install > Client > Client for Microsoft Networks. Click OK Restart computer.