SQL Server Cannot connect to PINAL.

Dear Friends.
I installed SQL Server on my system, but there is a problem with the connection, when I am trying to connect it.
It fails and then an error appears. Details of the error is given below so that you can understand the original problem easily.

Cannot connect to PINAL.
Additional Information:
An error has occurred while establishing a connection to the server. When connection to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes provider, error: 40 – Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
OK
Thanks
