are there any *concise* build directions for windows

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To build OpenCV for Windows you will need cmake and Visual Studio:

• create build folder near opencv sources folder and go into this folder
• <full-path-to-cmake>\cmake -G"Visual Studio 12 Win64" -DWITH_IPP=ON -DBUILD_SHARED_LIBS=ON -DWITH_OPENCL=OFF ../opencv
• <full-path-to-cmake>\cmake --build . --config release -- /maxcpucount:4

Notes:

• run described commands in terminal (cmd.exe)
• use appropriate Visual Studio generator name - the -G cmake option (check output of cmake --help for possible variants)
• take a look at build logs: some random windows build