title: SQL Server 2008 database engine login failed for administrator user in windows 7
body: <p>I installed SQL Server 2008 Enterprise Edition on Windows 7 Ultimate from sadegh user. </p>
  
  <p>This account exists in administrators role. after a few days I removed sadegh user from Windows and now I am using administrator user. But I can't login to SQL Server database engine using Windows authentication method and I receive this error message:</p>
  
  <blockquote>
    <p>TITLE: Connect to Server</p>
    
    <p>Cannot connect to SADEGH-PC.</p>
    
    <p>ADDITIONAL INFORMATION:</p>
    
    <p>Login failed for user
    'Sadegh-PC\Administrator'. (Microsoft
    SQL Server, Error: 18456)</p>
    
    <p>For help, click:
    <a href="http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&amp;EvtSrc=MSSQLServer&amp;EvtID=18456&amp;LinkId=20476" rel="noreferrer">http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&amp;EvtSrc=MSSQLServer&amp;EvtID=18456&amp;LinkId=20476</a></p>
  </blockquote>
  
  <p>please help me! thanks</p>