Installing "SQL Server 2000 Client" and "SQL Server 2000 service pack 4" Installing "SQL Server 2000 Client" and "SQL Server 2000 service pack 4". 

I am new to SQL server and want to know if both are different and the exact steps that i need to follow for installation. Please advice.
The SQL Server 2000 Client is the driver, admin and query tools.  The service pack is an update for the tools and the server.

I'd recommend looking at a newer version.  Your options are SQL Server 2005, SQL Server 2008, SQL Server 2008 R2 and the soon to be released SQL Server 2012.