Error Message:

One of your computer's NetBIOS names is already registered on the remote network.

Explanation:

Another computer with the same computer name is already logged on to the remote network.

User Action:

Each computer on the network must be registered with a unique name. Verify the following: A computer with the same computer name as yours is not located on the network you are connecting to. Your computer is not already physically attached to the network that you are attempting to connect to.