Internet Information Services need to have the .NET-related features checked in the Windows Features dialog box as shown below:
Besides that, these features need to be registered. This is done with the tool aspnet_regiis.exe, which should be installed in the .NET Framework directory. For more information check this MSDN article: ASP.NET Integration with IIS 7.
If you still have troubles installing Telerik Report Server, please open a support ticket and let us help you.
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