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You need to start the service for the TNS Listener. The service should appear in the services control panel with a name such as "OracleOraHome91TNSListener." If you used the database creation assistant (DBCA) to create the database, the listener should already be properly configured and you'll just need to start it. You may want to set the service for automatic startup so that it will automatically start each time the system is rebooted.
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