I have GraphViz 2.32 installed in Windows 8 and have added C:\\Program Files (x86)\\Graphviz2.32\\bin to the System PATH variable. Still pydot is unable to find its executab
I am running a Windows 10 machine and had some problems, too. I installed graphviz via msi installer. Adding via System settings did not work for me.
I removed the installation with the msi and used chocolatey, a windows package manager. Removing the installed version is necessary, otherwise chocolatey won't install.
Now it runs fine. I would recommend doing it this way.