Disconnect your computer from a network or network drive
If you don't want your computer to be on a network, you can disconnect it without having to unplug any cables. You can also disconnect your computer from shared network drives that you no longer use.
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Open Network Connections by clicking the Start button 
, clicking Control Panel, clicking Network and Internet, clicking Network and Sharing Center, and then clicking Manage network connections.
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Right-click the network that you want to disconnect from, and then do one of the following:
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For a wireless, dial-up, virtual private network (VPN), or incoming connection, click Disconnect.
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For a local area network (LAN) connection, click Disable.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
If you disable a LAN connection, the network adapter is disabled until you reconnect.
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Open Computer by clicking the Start button , and then clicking Computer.
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Click the Tools menu, and then click Disconnect Network Drive.
If you don't see the Tools menu, press ALT.
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Click the drive that you want to disconnect from, and then click OK.
