During an installation of Microsoft SQL Server 2008 R2 x64 Standard Edition on a Windows Server 2008 R2 Service Pack 1 x64 Standard Edition operating system, I encountered issues on the Feature Selection screen.
Issue #1 - While the installation is 64bit, the Shared Feature Directory is hard coded as x86 - this is wrong.
Issue #2 - Error: "The INSTALLSHAREDWOWDIR command line value is not valid. Please ensure the specified path is valid and different than the INSTALLSHAREDDIR path."
3. Delete the key.
"INSTALLSHAREDDIR" is the 64-bit shared component files directory with a path of "Program Files\Microsoft SQL Server" (Microsoft Support, 2011)
"INSTALLSHAREDWOWDIR" is the 32-bit shared component files with a path of "Program Files(x86)\Microsoft SQL Server" (Microsoft Support, 2011)
When specifying the the directories, there are known issues with putting a "\" at the end of the path. For this reason, omit the symbol.
Good - Program Files\Microsoft SQL Server
Bad - Program Files\Microsoft SQL Server\
Microsoft Support (2011). You receive an error message if you change the "Shared component directory" path on the Feature Selection screen when you install SQL Server 2008 on a computer that is running an Itanium-based version of Windows. Retrieved May 17, 2011 from http://support.microsoft.com/kb/955458.
MSDN (2011). How to: Install SQL Server 2008 from the Command Prompt. Retrieved May 17, 2011 from http://msdn.microsoft.com/en-us/library/ms144259(SQL.100).aspx.
MSDN (2011). Feature Selection. Retrieved May 17, 2011 from http://msdn.microsoft.com/en-us/library/ms143786.aspx.
MSDN (2011). File Locations for Default and Named Instances of SQL Server. Retrieved May 17, 2011 from http://msdn.microsoft.com/en-us/library/ms143547(v=SQL.105).aspx.