SQL Server Browser Service is installed as part of the SQL Server. But it is turned off by default to reduce the security risk. If you want start SQL Server Browser Service to allow the SQL Server to accept network connections, you need to follow the steps below:

1. Go to Control Panel > Administrative Tools.

2. Double click on "Services". The Services window shows up.

3. Double click on "SQL Server Browser". The properties dialog box shows up.

4. Change the "Startup Type" from Disabled to Automatic. Then click the Start button.

The "SQL Server Browser" service should be running now.