http://blogs.msdn.com/b/vsnetsetup/archive/2012/03/14/msdn-library-setup-for-visual-studio-2008-fails-to-install.aspx  Issue: When you try to install MSDN Library setup for Visual Studio 2008 it would fail with the below error message. "Setup has detected that the HTML Help data files are corrupt and cannot continue. Click Ok to close setup" Cause: Thisen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)