I have a server running Microsoft Server 2003 standard, SP2. The server hosts 4 instances of MSDE 2000. I am trying to upgrade them to SQL Server 2008. When I insert the SQL Server 2008 installation CD and follow the installation path to "Upgrade to SQL Server 2008" (as opossed to installing a standalone version of SQL Server 2008), I get to a screen asking me to "Select Features". There are two features in the window called "Shared Features" and "Redistributable Features", but they are greyed out and are therefore not selectable. When I click on "Next", I get an error message dialogue, when I close that, the error message at the bottom of the "select features" window says "there are no features selected for the upgrade", and I cannot continue (clicking "Next" loops the error message). I need to do an upgrade as I wish to retain the instance names so that I don't have to change the source of the databases in all my applications. Please help!