FIX: Visual C++ compilers are removed when you upgrade Visual …
https://support.microsoft.com/en-us/topic/fix-visual-c-compilers-are-removed-when-you-upgrade-visual-studio-2010-professional-or-visual-studio-2010-express-to-visual-studio-2010-sp1-if-windows-sdk-v7-1-is-installed-f0573998-9dac-5f49-cabe-5a8a2539c5e7
WEBStatus. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. More Information. If you try to install Windows SDK v7.1 after you upgrade to Visual Studio 2010 SP1, the Visual C++ compiler features might be blocked during the setup process.
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