provider : named pipes provider, error : 40 - could not open a connection to sql server in visual studio2010 ultimate

i installed visual studio 2010 ultimate on my sony vaio with windows 8 64 bit single language
when i try to do add new connection in server exeplore it gives me following error
A network related or instance specific error occur while establishing connection to Sql sever .the  server was not found or was not accessible . verify that the instance name is correct and that the sql server is configured to allow remote connection(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)& ...