UNABLE TO OPEN PDF ON MY MAC!

Can someone help me with this error message below?  It is preventing me from opening PDF files on my MAC but not on my PC.  Thank you!
"Adobe Reader could not open 'AIS_Research_Compression.pdf' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded)."

The message says:
Please wait
If this message is not eventually replaced by the proper contents of your document, your PDF viewer may not be able to display this type of document. 
Then it goes on to suggest an Reader upgrade, which I already did. 

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