Installing SQL Server 2008 R2 Standard SP2 from scratch

Hi,

I've just done a little "inventory" in an SQL server containing SQL Server 2008 R2.  I found out that after SP1, SP2, hotfixes, etc, everything related ONLY to SQL counts up to more than 7GB (if not more) in the hard drive!!  And guess the size of the database?  Only 300 MB!

So naturally, I find the files making up SQL server are excessively too big.

I would like to install SQL server from zero in other computer so I would like to ask one stupid question:

Is there a package/installer which includes everything from "SP0" up to "SP2" for SQL Server 2008 R2?  I have found the SP2 setup at http://www.microsoft.com/en-us/download/details.aspx?id=30437

but as far as I can tell, it needs SQL Server 2008 R2 being installed beforehand to work.  Hence my question.

Thanks in advance