sql server - VS2010sp1 and SQLServer 2012 Express- A network-related or instance- -

Recently I Due to the boot sector error, my laptop's

now I have a small problem on vs2010sp1, error occurs in the database ...

  When installing a connection to SQL Server A network related or instance-specific error occurred. The server was not found or was not accessible. Verify that the example name is correct and SQL Server is configured to allow remote connection. (Provider: SQL Network Interface, Error: 26 - Error specifying server / instance)   
 has been done so far;  
 - Reset i sqlserver  
 - TCP / IP is enabled in the Client Protocol (SQL Server Configuration Manager)  
 
 VS2010sp1 Tools-> Options & gt; Data connection - & gt; The name of the SQL Server intestine (blank for the default) I set it to blank.   
 But there is still no effect PLG help.  
 Tahnks   
 
 
 Check that you have a SQL Server port (default 1433) The exception to the Windows firewall is