To set Adobe as your default pdf viewer in Windows 10:

1. Right-click the start button from the bottom-left corner of the screen.

2. From the menu that appears, click control panel.

3. On the control panel window, click the programs category.

4. From the right pane of the opened programs window, click default programs.

5. On the default programs window, click associate a file type or protocol with a program.

6. From the list file types, scroll down to .pdf and highlight by left-clicking once and click the change program button.

7. Select Adobe in the pop-up window, then click ok, this will set all pdf files to open with Adobe.