I believe I have MS SQL Server version 2005, and version 2008 (x64), on my computer. When I connect to localhost in SQL Server Management Studio 2008, the tree on the left says "localhost (SQL Server 9.0.4053)". Also, running:
SELECT SERVERPROPERTY('ProductVersion')
returns 9.00.4053.00.
How do I select 2008 as the version I wish to use?