Some readers can experience problems opening PDFs. Sometimes these issues are related to web browsers and old versions of Adobe Acrobat.
There is a useful page at
http://helpx.adobe.com/acrobat/kb/cant-view-pdf-web.html
which provides information about addressing these problems.
Sometimes it can help to change the Adobe reader settings. The following instructions explain how to do this:
To configure the browser to use Acrobat or Adobe Reader to open PDF files:
1. Close your web browser.
2. Start Acrobat or Adobe Reader.
3. Choose Edit > Preferences.
4. Select Internet in the list on the left.
5. Deselect Display PDF in Browser, and click OK.
