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'ORA 12542: TNS: address already in use' error

How do I resolve this error please:

'ORA 12542: TNS: address already in use'. OraOLEDB error 80004005

The Listener configuration file, LISTENER.ORA contains an address entry that may look something like this:

(ADDRESS = (PROTOCOL = TCP)
           (HOST = dbserver.mycompany.com)
           (PORT = 1526)
)

That combination of address configuration information is already in use (most likely the port is already being used by some software). Change your configuration to be unique for this listener and then you will be able to start it.

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