NetBT stands for NetBIOS (Network Basic Input/Output System) over TCP (Transmission Control Protocol) and is a critical component of computer networking that allows for a set of basic commands to be issued across a network. It is used by programmers to provide consistent functionality between computers and for the discovery of network devices (http://www.techterms.com/definition/netbios). If you are encountering difficulty with your connection, clearing NetBT will reset all of your computer's active NetBIOS connections.
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Step
Open the Start menu by clicking on the "Start" button.
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Click "Run" if you are running Windows XP or earlier, or click in the "Search" bar for Windows Vista or later.
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Enter the text "cmd" without quotes. Press Shift+Enter to run this as an administrator on Windows Vista or later operating systems.
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Enter the command "nbtstat -R" without quotes in the command prompt. Press enter to run it. Your current NetBT connection list will be cleared. (http://technet.Microsoft.com/en-us/library/bb727023.aspx)