Why SQL Server Management Studio 2014 can not connect? - sql-server

I have installed sql server 2014 in my windows 7.when i am trying to connect to
server it is always shown error either windows authentication or sql server
authentication.
Error:
Connect to Server
Additional Information:
A network-related or instance-specific error occurred while establishing a
connection to SQL Server. The server was not found or was not accessible.
Verify that the instance name is correct and that SQL Server is configured to
allow remote connections.
I checked Services.msc ---> Here server is running (MSSQL Server)
I started manually so,still it is showing cannot connect to server.
What's the issue? Can anyone help to solve this isssue?
Thanks.

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TITLE: Connect to Server
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ADDITIONAL INFORMATION:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
The system cannot find the file specified
I'm pretty sure that my computer or server is name is NUNA but it doesn't connect and I get this error. I have tried to stop SQL Server Express in Windows Services, but it doesn't show the SQL Server Express
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Additional information:
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Verify that the instance name is correct and that SQL Server is configured to allow
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