Do you have a PDF reader installed? If not....................
Foxit Reader
http://www.foxitsoftware.com/Secure_PDF_Reader/
If you do have a PDF reader installed, create an association.
Right click on the file.
Select: Open With from the pop-up
menu.
Click: Choose [default] Program.
Select: Your PDF reader
program.
Check: Always use the selected program to open this kind of
file.
Click OK.