installing opencv with visual studio 2017

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So, I was attempting to install OpenCV using Pre-built libraries per Bernát Gábor's tutorial. The last step is to set the OpenCV environment variable and add it to the path of the system.

I had two issues at this step: 1. What would be the correct command line prompt for Visual Studio 17 (none given in tutorial) and 2. I get this message(ERROR: Access to the registry path is denied) even when I input the command line for VS 15.