Please follow the instructions to install Plato Video  Converter

  Double Click "PlatoVideoConverter.exe"
  in "Welcome" page, click "Next"
  in "Choose destination location" page, select the folder where
     want the application placed
  now you finish installing Plato Video Converter
  Finish All.
  If you have installed the lower version of Plato Video Converter,
     recommended you firstly remove it ,and repeat step(1)-->step(4)

The install program will automatically upgrade the appropriate files.

uninstalling Plato Video Convertor

Click on Start, then Settings, then Control Panel. Double-click the Add/Remove Programs icon in the Windows Control Panel. Select Plato Video To Audio Convertor in the list of installed programs and click the Add/Remove button. Follow the instructions.