Image viewing quality

[embroid]

Hi

I am using a Canon EOS500D. I have two Full HD 22" LCD screens attached to my pc.
One is connected digitally and the other has an analogue connection.

When I view my pics (jpegs) with either Windows Picture & Fax viewer or Canon Zoom EX Browser, the image quality is not great. If I view the same jpeg image using Canon DPP software, the image quality is about 3 times as good.
Even if I switch the images to the opposite screens, i.e. digitally connected and analogue screens, the result is the same. The image as viewed in the Canon DPP software is MUCH clearer than the identical image displayed with either Canon Zoom EX browser or Windows Picture & fax viewer.

Can anyone explain why the difference in quality? Also, I would obviously like to do slide shows using the DPP software so I can enjoy the much better quality, but DPP does not have a slide showing capability. Any ideas of software to use for slideshows which will give image quality as good as DPP?