Error dot command Ontoviz on Protege

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Java.IO.IOException : cannot run program “dot” : Create Process error =2 , The system can not find the file specified

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Protege has plugin which has capability to show/visualize  graph of ontology model. How to do that. Of course, you have to download the library Graphviz first. Once you downloaded this plugin then install it.  Supposed that you installed it on C:/Program Files/Graphviz . Then download ontoviz-tab on Protege site. Ok, i assumed that you that have already installed that add-on and have followed the instructions in readme.txt included in installation directory. When you try to start Protege and open Ontoviz tab ( Goto Project -> Configure, then Configure Tab will appear and check Ontoviz) ,