SUP with the /clr and /ZW incompatibility? For that matter why /ZW and not /clr, and if you are a beginner why should you care?
Now, C++ is separated from .NET, sort of, if you set the complier tag to /ZW you cannot use /clr which is the setting for the C++ to be able to use .NET. The /ZW means you can use the WinRT. WinRT and .NET are not compatible.
WinRT are Win 8 APIs based on classes, objects and members. C++ programmers expect to call C runtime APIs and WinRT APIS.
WinRT versus .NET
Uggh, I give up, just go to this excellent article on how the WinRT and .NET functions: