The installation and configuration is outlined below. The links within the text will display screen shots to assist you in the configuration process.
If you have not done so, download the viewer. Download here. I suggest that you download the jcamp.exe to your program files folder. In any event you must remember where you saved this file.
Double click on My Computer on the desktop.
Click on the View:options menu selection.
When the options dialog appears click the File types tab and press the New Type button.