Reader 9.3 PDF Files are flagged as "unknown file type" in Win XP

Installed Reader 9.3 replacing version 5.1 on my Win XP with SP 2. I have the Microsoft automatic update feature set "on" so I assume that overall my WIN XP is up to date. Having a problem downloading PDF files from trusted Internet sites. No longer getting seamless presentation of the data in the file. Instead, I get pop up security warnings which I have to click and then when I try to download the PDF it tells me that the file type is "unknown". Is this a  v 9.3 problem or a WIX XP problem or both? Is there a solution?

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