I am receiving the error below.  I am attempting to install 4.8.4 Source Package on Server 2003, IIS6, VS2008, SQL Server 2005.  Has anyone seen this problem?  Some of my web.config settings:

<add key="InstallTemplate" value="DotNetNuke.install.config" />

<add key="AutoUpgrade" value="true" />

<add key="UseInstallWizard" value="true"/>

<add key="InstallMemberRole" value="true" />

<add key="ShowMissingKeys" value="false" />

<add key="EnableWebFarmSupport" value="false" />

<add key="EnableCachePersistence" value="false"/>

<add key="HostHeader" value="" />

Server Error in '/dnn' Application.

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Unable to cast object of type 'System.Web.Configuration.ScriptingAuthenticationServiceSection' to type 'System.Web.Configuration.ScriptingAuthenticationServiceSection'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Web.Configuration.ScriptingAuthenticationServiceSection' to type 'System.Web.Configuration.ScriptingAuthenticationServiceSection'.

Source Error:

[InvalidCastException: Unable to cast object of type 'System.Web.Configuration.ScriptingAuthenticationServiceSection' to type 'System.Web.Configuration.ScriptingAuthenticationServiceSection'.]
   System.Web.Configuration.ScriptingAuthenticationServiceSection.GetConfigurationSection() +42
   System.Web.Security.AuthenticationService.EnsureConfigLoaded() +91
   System.Web.Handlers.ScriptModule.ShouldSkipAuthorization(HttpContext context) +93
   System.Web.Handlers.ScriptModule.AuthenticateRequestHandler(Object sender, EventArgs e) +59
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64