Installation of SQL Server 2005

Using Windows 7 Ultimate, after installation of SQL Server 2005, an error occurs regarding Connection. (Settings for Database Engine)
Login failed for user 'Admin\vilas'. (Microsoft SQL Server, Error : 18456)

       
To resolve this error please follow the steps given below:

• Set Security Permissions for SQL Server 2005---Properties.
  
  
  
  
  
• Select Security tab and give the permissions for user name.
  
  
  
  
• Run SQL Server 2005 --- now the System has been given a server name by default and loads SQL Server 2005 successfully.