1. Press Windows on either the keyboard, or bottom left of your screen.

2. Click the Settings icon.

3. Go to the Apps tab on the right side.

4. On the left side, go to Default Apps.

5. Scroll down and click Set Defaults By App.

6. Click Adobe Acrobat DC on the list of programs and click Manage.

7.  On the left side is a list of file types. Scroll down to PDF. Next to the PDF tab is a program. Click that, and on the popup, click Adobe Acrobat DC.