You can't find Adobe Reader (or Acrobat Reader) on your computer or it gives you an error when you try to open the document.
1) You need to download a fresh copy of the software.

You can download the FREE version of Adobe Reader here.

N.B. Your version of Adobe Reader may be working fine for simple PDF documents that does not mean you can skip this step.

Please select your response by clicking on the most appropriate answer ...
I have downloaded Adobe Reader.	I cannot download it.	I don't understand your instructions.