Good question, I thought I was the only one having problems as well
PGN Viewer?
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SCID(http://www.chess.com/download/view/scid-37-beta-3) seems to be the best VISTA compatable free PGN viewer/editor I could find. callmeaspade pointed it out to me on another thread. It can be found in the download section of this site. I tried it out and it was very useful for what I am using it for.
Is there a Vista compatable PGN viewer?