I see many questions on the difficulties of properly installing pygraphviz and graphviz on Windows for Python 2.7. But no answers that I have found
pygraphviz
graphviz
You'll find loads of install-ready packages on this site: http://www.lfd.uci.edu/~gohlke/pythonlibs/ including the ones you tried to install. I know I'm way too late with the answer but I just became a member.