SQL Server 2003

is a version of SQL Server that doesn't exist.  Before it was common to link the database engine with the Operarting System.  When Windows 2003 came out, it was expected that there would be a SQL Server 2003 release too.

This has not been the case.  These are the current versions of SQL Server;

  •     2008
  •     2005
  •     2000
  •     7.0
  •     6.5
  •     6.0
The version you're probably looking for is SQL Server 2005.  SQL Server 2008 does not have an Service Pack associated with it yet, whereas SQL Server 2005 is up to Service Pack 3.  SQL Server 2003 is dead, long live SQL Server 2005, er, 2008.