After the driver is installed, it can be configured. For this, in the Control Panel open Administrative Tools and find the Data Sources (ODBC) tool:
Now you have to add the ODBC Driver for SQL Server to the list of System Data Sources or User Data Sources or File Data Sources using the ODBC Data Source Administrator dialog.
For this, click the Add button - the Create New Data Source dialog will appear with a list of available drivers.
Select ODBC Driver for SQL Server and click Finish.
Then you will be suggested to configure the driver.
To activate the driver via ODBC Administrator, refer to the Product Activation article for more details.
In the appeared connection dialog, you can set the connection options.
Then you can click OK and finish configuration or switch to the Advanced settings tab to specify more detailed Connection String. See the full list of supported connection string options in the Connection Options article.