I have the current drive, but can't open the PDF files online

I have the course Adobe Reader is installed, but encounter a problem in opening the PDF documents online.  My computer says "this document PDF may not display correctly."  Open with a different drive. »

I tried today and got this message:

To view all of the content of this document, you need a later version of the PDF Viewer. You can upgrade

to the latest version of Adobe Reader from www.adobe.com/products/acrobat/readstep2.html

For support, go to www.adobe.com/support/products/acrreader.html

On Mozilla Firefox browser 21.0

How can I fix this please?

See also http://forums.adobe.com/thread/1158136

Tags: Acrobat

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    --------------------------------------------------------------------------------------------
    Rob Brown - Microsoft MVP<- profile="" -="" windows="" experience :="" bicycle="" -="" mark="" twain="" said="" it="">

    .

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