Steps:





  1. Right-click the thumbnail of a PDF file, and then click Properties.




    Right-click and click Properties




  2. In the file's Properties dialog box, click Change.




    Click Change




  3. Choose Adobe Acrobat Reader or Adobe Acrobat, and then click OK.




    Choose Acrobat Reader or Adobe Acrobat




  4. In the Properties dialog box, click OK.




    Click OK in the Properties dialog box