How to Fix a Network Resource That Is Unavailable
When you try to access a computer or other networked device from a Windows machine, you may receive a message that tells you that the network resource is unavailable. This problem is generally caused by a network issue that is typically very easy to fix through rebooting your computer's network interface card (NIC).
Log into the computer that is receiving the error message.
Click "Start" then type "View Network Connections" and press "Enter."
Right-click on your wired or wireless network connection in the list, depending on whether you are using a wired or wireless network.
Click "Disable" and then wait 30 seconds for the network card to fully shut off.
Right-click on the connection again and click "Enable" to turn it back on and fix the network resource issue.