Windows Server 2008 R2 already has .NET 3.5 SP1 installed but it is not turned on.  The Role Management Tool must be used to enable .NET 3.5 SP 1 for use with WebPortal.  

  1. Open the Server Manager
    1. Go to Start, All Programs, Administrative Tools
    2. Select Server Manager
  2. Install IIS, if not already installed
  3. Enable .NET 3.5 SP1 in the Add Features Wizard
    1. In the Server Manager, right click on Features and select Add Features
    2. Check .NET Framework 3.5.1 Features
    3. Click Add Required Features in the Add Features Wizard dialog, if it appears
    4. Click Next
    5. Click Install
    6. When the installation is complete, click Close