Unable to open PDF file when using Internet Explorer 9

If the user wants the browser to open PDF files in a separate Acrobat window, the browser needs to be configured to use Acrobat or Adobe Reader as a helper application.
Then, when the user selects a PDF file in Internet Explorer or AOL, the browser opens the PDF file in an Acrobat window instead of the browser window.

To configure the browser to use Acrobat or Adobe Reader to open PDF files:
1.  Close Internet Explorer 9 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.
6.  Restart Internet Explorer or AOL.

Note:
The next time a link to a PDF file is clicked by a user, the browser may prompt the user to open or save the file. If the user chooses to open the file, then the browser opens the file in the helper application that has been specified. If the user chooses to save the file, then the browser downloads the file to the hard disk.