Rule "Microsoft .NET Framework 3.5 Service Pack 1 is required" failed.-> SSMS Express 2012 on Windows 7

I'm trying to install SQL Server Management Studio Express 2012 on my Windows 7.  I have Microsoft .NET Framework 4.0 Client Profile, Extended and Multi-targeting Pack on my machine.

I also have had Visual Studio Professional Edition recently installed if that makes any difference.

The install for SSMS is failling on the installation rules screen at:

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Rule Check Result
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Rule "Microsoft .NET Framework 3.5 Service Pack 1 is required" failed.

This computer does not have the Microsoft .NET Framework 3.5 Service Pack 1 installed. If the operating system is Windows Vista or Windows Server 2008, download and install Microsoft .NET Framework 3.5 SP1 from http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=22. If the operating system is Windows 7 or Windows Server 2008 R2, enable the .NET Framework 3.5 feature. A computer restart may be required after installing.
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Taking a hint from the error message,  I went to Turn Features On and Off,  but I saw only Windows Communication Foundation HTTP Activation

and

Windows Communication Foundation Non-HTTP Activation

under microsoft NET Framework 3.5.1.  So I checked those boxes and restarted. No help.

One possible other guess from this thread:

http://social.msdn.microsoft.com/Forums/en-US/sqldensetup/thread/c06365c5-ce96-4fc8-a12b-6c123c39044c/

is that I may need to "enable the application role (including .NET 3.5) through the OS"?

How would I do that on a Windows 7?

Or if there are other solutions, please let me know.

Thanks!

- Michele