Keep getting "the acrobat dc pdf browser plug-in is missing. Please reinstall acrobat dc or acrobat reader dc to fix this problem" I don't have DC i Have X?

So I purchase a new PC a couple years ago and it came loaded with DC Reader.  I have since installed Acrobat X Standard.   I have no problems using any of the software.  My problem only is when I open up my Outlook Live email account in Internet Explorer 11.  It constantly pops up "The Acrobat DC PDF browser plug-in is missing. Please reinstall Acrobat DC or Acrobat Reader dc to fix this problem."  Every time I go to a different folder, or inbox, or open up an email.  Once I hit the "OK" button 1-100 times......   then everything works like normal and I can open up PDF attachments.  They open in Acrobat X.  When I switch to a new email or folder etc.  it all happens again.   What can I do to stop this?

Thanks

Garey