SQL Native Client ODBC Driver
Standard security
Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;
Are you using SQL Server 2005 Express? Don't miss the server name syntax Servername\SQLEXPRESS where you substitute Servername with the name of the computer where the SQL Server 2005 Express installation resides.
Trusted Connection
Driver={SQL Native Client};Server=myServerAddress;Database=myDataBase;Trusted_Connection=yes;
Equivalent key-value pair: "Integrated Security=SSPI" equals "Trusted_Connection=yes"