Hi trircommuncations,
I hope we can help here, but I don't have much information to go on. Were you sent a PDF in email? Is it a form that you need to fill in? If so, you will need the free Adobe Reader. You can download reader from here: PDF reader, PDF viewer | Adobe Reader XI.
If I missed the boat, please let me know, and we'll do what we can to help.
Best,
Sara