You can set Adobe Reader as the default programme for viewing pdfs on Windows computers by following these steps:
1. Click on the Start button and select the Settings cog
2. In the Windows Settings display, select Apps
3. Within the App list, select Default apps. At the bottom of the default apps page, select Set defaults by app
5. The Set Default Programs window will open
6. Under the list of programs on the left, click on Adobe Acrobat Reader DC
7. Choose Set this program as default
8. Select OK
9. The next time you open a pdf it will automatically open in Adobe Reader