You must install SP2 of SQL 2005 Express on Windows Vista RTM

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If like me, you might have ignored the "compatibility" warning message when installing SQL 2005 Express SP1 on pre RTM builds of Vista. It would still install and for messing around/testing it didn't seem to make too much difference.

Well with the RTM build of Windows Vista installing SQL Express 2005 SP1 will now fail midway so you must install SQL Server 2005 Express SP2 – currently available as a CTP build from https://www.microsoft.com/sql/ctp.mspx

I'm assuming the same will be true on the SQL Server Developer Edition...

Cheers, Dave