after installation with "Web Platform Installer 4.0" Windows Server 2008 / IIS 7, I get this error message on the site page:

FOR SAGEFRAME

Server Error in '/site1' Application.

Configuration Error

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. 

Parser Error Message: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.

Source Error: 

Line 53:             during development.
Line 54:     -->Line 55: <compilation debug="false" targetFramework="4.0" batch="true" numRecompilesBeforeAppRestart="250" optimizeCompilations="true"> Line 56:       <buildProviders>
Line 57:         <add extension=".csproj" type="Orchard.Environment.Extensions.Compilers.CSharpExtensionBuildProviderShim" />

Source File: C:\inetpub\wwwroot\msite\web.config Line: 55 

Version Information: Microsoft .NET Framework Version:2.0.50727.5466; ASP.NET Version:2.0.50727.5456 

-------------------------------

FOR Orchard

Server Error in '/' Application.

The resource cannot be found.

Description:HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly.

Requested URL: /

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272