Web Access 2010 Beta 2 is broken on Windows 2008 R2

Scenario After installing Team Foundation Server 2010 Beta 2 on a Windows 2008 R2 server, when you navigate to Web Access site, you get the following error message:   Configuration Error Parser Error Message: Could not load file or assembly ‘System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35′ or one of its dependencies. The system cannot find the file…

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