What am I missing; I believe that I have all of the prerequisites installed??
Configure a Windows project to use Clang tools
To configure a Visual Studio project to use Clang, right-click on the project node in Solution Explorer and choose Properties. Typically, you should first choose All configurations at the top of the dialog. Then, under General > Platform Toolset, choose LLVM (clang-cl) and then OK.
When I open Solution Explorer and choose Properties, I don't get the above output; instead I get this: