I was lazy and decided to uninstall my Beta SharePoint, delete all of the databases, then re-install SharePoint 2010 RTM on my server.  Everything ran perfectly through the install until I ran the SharePoint Products Configuration Wizard and received the error shown below.

Task configdb has failed with an unknown exception
07/14/2010 10:39:47 8 ERR Exception: System.InvalidCastException: Unable to cast object of type ‘Microsoft.IdentityModel.Configuration.MicrosoftIdentityModelSection’ to type ‘Microsoft.IdentityModel.Configuration.MicrosoftIdentityModelSection’.
at Microsoft.SharePoint.Administration.SPIisWebServiceSettings.ProvisionWebSiteSettings()
at Microsoft.SharePoint.Administration.SPIisWebServiceInstance.Provision()
at Microsoft.SharePoint.Administration.SPFarm.Join()
at Microsoft.SharePoint.PostSetupConfiguration.ConfigurationDatabaseTask.CreateOrConnectConfigDb()
at Microsoft.SharePoint.PostSetupConfiguration.ConfigurationDatabaseTask.Run()
at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()

Per the following technet post, there’s an issue with the version of the .NET 3.5 Geneva not properly updating. I believe this is due to the fact that my Windows 2008 R2 is actually 8 months old (from my SharePoint 2010):  http://social.technet.microsoft.com/Forums/en-US/sharepoint2010setup/thread/b123b76a-5c16-4611-879e-0cb14b1a638c

Open the web.config file located in C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\WebServices\Root and change the identityModel Version from 1.0.0.0 to 3.5.0.0

Delete your databases and then re-run the SharePoint products configuration wizard and it should now complete successfully.

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