This is a known issue http://support.microsoft.com/kb/2717426
CAUSE
This issue occurs when you install the Windows 7 SDK on a computer
that has a newer version of the Visual C++ 2010 Redistributable
installed.
RESOLUTION
To resolve this issue, you must uninstall all versions of the Visual
C++ 2010 Redistributable before installing the Windows 7 SDK. You may
have one or more of the following products installed:
- Microsoft Visual C++ 2010 x86 Redistributable
- Microsoft Visual C++ 2010 x64 Redistributable
After uninstalling the Microsoft Visual C++ 2010
Redistributable products, you may install the Windows 7 SDK. After
installing the Windows 7 SDK, you may then reinstall the newer version
of the Visual C++ 2010 Redistributable products, in order to restore
the Visual C++ 2010 Redistributable products to their original state.
