If you want to view RAW images on your desktop then here's a few options:
BBC IT suggest installing adobe photoshop elements or vsn 7, but that can be pricey.
I would strongly suggest installing the free software from Microsoft; "raw image viewer". This allows you to double click on the thumbnail and view like a jpg. Install it HERE. Microsoft will ask you for validation before you can install, just follow the quick instructions. Once that's done just double click and open the image as you would any other - you can now view it in the windows XP image and Fax viewer.
Here is another prog that I have used in the past and is particularly useful for batch converting to Tiffs and viewing Raws. Great general software.