Why is AdobePDFViewer saying it cannot find a compatible reader?

It started to be occasional, but now every time I try to open a PDF from the internet I get the following message:
"AdobePDFVIEWER cannot find a compatible Adobe Acrobat or Adobe Reader to view this PDF.  Please select one."
I have both Adobe Reader 7.0.8 and 9.2 installed.  When I open either application window, the applications are greyed out.
I am on a MacbookPro laptop, OSX 10.4.11 and it happens on the G4 desktop computer too.  The browser is the latest Safari.

(ps: rather then removing, I renamed the Adobe plugin to removed_Adobe....)
I doubt Safari will care what the file is called If it finds a plugin, it will try to use.
Try moving the file to your Desktop instead and then Quit and restart Safari.

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