An unaticipated error has occurred in the application.RetrieveTest

Installed the Training Kit Exam Prep application for Web App Development with .NET Framework 4 (MCTS Exam 70-515). I'm using Win7 x64 and when I try to Start a test I get the following error:

[MsLocalWare][5] An error occurred creating the form. See
Exception.InnerException for details. The error is: Class not registered (Exception

I Bing'ed and Google'd the error message, but dont' see anything helpful. How do I get the Practice Tests running?
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