sql server login problem

Question

Hi buddy,

 

I'm getting error while logging into sql server application.(2008 R2 edition). I had a default instance 

and I tried for

server name = 1. SQLEXPRESS,

                        2. (LOCAL)

                        3. (local)\SQLEXPRESS

                        4. 127.0.0.1

 

but failed.

Desplayed error: network related specific instance occer while establishing this connection.......

 

Pls help.

 

Thanks in advance.

Harish.