Unable to open pdf's sent to me

I have ensured that I am running the most up to date version of ACrobat Reader DC and still get this message whn I receive a pdf attached to an email or trying to open a pdf on a website. Any help would be appreciated. None of the methods suggested to repair the problem are effective.

"Please wait... If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document. You can upgrade to the latest version of Adobe Reader for Windows®, Mac, or Linux® by visiting http://www.adobe.com/go/reader_download. For more assistance with Adobe Reader visit http://www.adobe.com/go/acrreader."