pleaseonegaishimasu wrote:
If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document.
This means that you are not using Adobe Reader, but either a browser's own PDF viewer, or an operating system specific previewer. Installing Acrobat will not change anything about that.
You need to either use the Adobe Reader plugin in your browser, or download the PDF to your local disk before opening it in your browser.