As described here you can run into an error when trying to install Microsoft SQL Server 2008 (x86, 64bit) on a Vista (64bit). The error message is something along the line "The INSTANCESHAREDWOWDIR command line value was not specified. This value must be specified when the INSTANCESHAREDDIR value is specified."
You can run into the same issue on a Windows 7 (64bit) as well as I had to learn today. I used the default installers for SQL Server 2008 Developer Edition, 64 bit.
One additional note, though: If you have accidentally changed the default installation path to something that works for you and then back to the default, the error might not go away. In that case cancel the installation and start all over. This time, don't touch the default installation path.
This approach worked in my case. Of course, if you prefer the software to be installed in a different location or drive, you may have to try the workaround described here.
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