EmperorFool
Deity
That is very odd. The Access Denied certainly seems to be a path issue which Visual Studio is interpreting as the folder not existing. Try running VS as admin to see if you get a different error.
As for nmake not knowing how to build CvArea.cpp, where are you running nmake from? Are you in the folder that has makefile and CvArea.cpp? It's acting like it cannot find CvArea.cpp and is thus trying to build it. Since there's no target for it, it gives you that error.
As for nmake not knowing how to build CvArea.cpp, where are you running nmake from? Are you in the folder that has makefile and CvArea.cpp? It's acting like it cannot find CvArea.cpp and is thus trying to build it. Since there's no target for it, it gives you that error.