Added help to the Windows install section
Added help to the Windows install section

When attempting to install the Windows 7.1 SDK it may error without reason. This can be caused by having prior C++ 2010 redistributables installed. Uninstalling these redistributables will allow the Windows 7.1 SDK to install successfully.

References:
http://support.microsoft.com/kb/2717426
http://stackoverflow.com/questions/1901279/windows-7-sdk-installation-failure
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