I have been running on XP Pro for more than 2 years. All of a sudden, when I try to view a .tif from the internet, I get a message in Windows Picture and Fax Viewer that "no preview is available." The preview window comes up, but after processing, shows the message. If I elect to save the image to my desktop rather than view it, there is no problem, I can just double clik the image and it comes up. Any idea why I can no longer preview?