I had the SQL Server 2008 Express database engine installed [alongside SQL Server 2005 management studio] and that worked fine. However when I tried to install the client tools from the SQLManagementStudio_x85_ENU download it quickly fails after reqporting
a 'Value cannot be null' error which causes an exception in the setup.
I removed all existing SQL Server 2008 components from the machine and attempted to re-install from scratch.
I downloaded the SQL Server 2008 R2 Express Database and Management tools install from
http://www.microsoft.com/express/Database/InstallOptions.aspx but this install failed the Setup Support Rules - reporting SQL Server Setup Product Incompatibility. The detailed
report shows 'This version is not compatible with a later installed version. For more information, see the compatibility information at
http://go.microsoft.com/fwlink/?LinkId=160850' [Incidentally this link is broken!]
Now, as I mentioned at the start, I do have an earlier version of SQL Server Management studio installed but there are no other install versions of the engine and certainly not a later version!
So I had a look in the log files left by the install and found the failure reported in the detail_globalru
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