Right click on the pdf file, then select Properties. In the Properties window, select the Open With tab. Find Acrobat Reader in the list of applications and select it, then press the button that says Set as Default. That should do it!
Right click on the pdf file, then select Properties. In the Properties window, select the Open With tab. Find Acrobat Reader in the list of applications and select it, then press the button that says Set as Default. That should do it!