To set Adobe as your default pdf viewer in Windows 10:
- Right-click the start button from the bottom-left corner of the screen.
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From the menu that appears, click control panel.
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On the control panel window, click the programs category.
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From the right pane of the opened programs window, click default programs.
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On the default programs window, click associate a file type or protocol with a program.
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From the list file types, scroll down to .pdf and highlight by left-clicking once and click the change program button.
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Select Adobe in the pop-up window, then click ok, this will set all pdf files to open with Adobe.