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Are you receiving an error, or just believe that you need to install .NET 3.5 SP1?
.NET 3.5 SP1 is built in to Windows 7, but it may need to be activated (run appwiz.cpl, or OptionalFeatures.exe directly as Administrator, see attached screen capture--the blue box indicates that needed parts of the .NET 3.5 SP1 are active, does not need to show the checkmark).
But if you have a functional .NET 4.0, the .NET 3.5 SP1 feature is probably already present and active. There are also tools to test that the .NET framework is fully functional, available from Aaron Stebner's msdn blog here.
If still stuck, let us know additional details of your installation and we may be able to help.
OptionalFeatures.PNG 47.3 K