:a. Go to the Graphviz website [http://www.graphviz.org/Download..php Graphviz Downloads] and select the installer package that is appropriate for your machine. For Windows, this is the Microsoft installer file: graphviz-2.34.msi
:b. Install graphviz and remember the path name of the installation folder
:c. Open Protege and go to the File/Preferences menu option. Once open, go to the OWLViz tab.
:d. Manually enter or use the browse button to select the Dot Application Path to the dot.exe file. If your path name contains a space, include the entire name in double quotation marks: "C:\Program Files\Graphviz2.34\bin\dot.exe"
:e. Select the "OK" button.
:f. Open and ontology and navigate to the OWLViz tab in Protege.
:g. Select one of the classes in Class Hierarchy and confirm that you can see a graph of the class including it's parent and children classes.