When you are not able to open PDF files in Adobe Reader, follow the steps below:
Make sure to set Adobe Reader as the default PDF owner.
You need to update your Adobe Reader or Acrobat DC.
Or try repairing your Adobe Reader using a repairing tool.
This steps should help you dissolve the problem. However, if this does not work then you can contact to avail the services of technicians who are qualified to handle the problem.
Read more: -