1.open your cmd and run:<br>
2.change your root directory from //Magento root directory//<br>
3.change location of drive 
  
    D:\xampp\php\php.exe D:\xampp\htdocs\<Magento root directory>\bin\magento indexer:reindex

in your case it would be:

    C:\xampp\php\php.exe C:\xampp\htdocs\magento_2.0\bin\magento indexer:reindex