viewing pdf from web browser

I have both Acrobat 9 Standard and Adobe Reader 9. When I installed both a question was asked do I want Acrobat or the Reader as my default viewer. I chose Acrobat. However, now when I go to a web site with a PDF I want to download, a message comes up that says in substance that the download is not supported. Does anyone have an answer on how to fix this problem so that I can download PDF's posted on the Web. Note: I have already clicked the tab that talks about allowing Third party Extensions on the advanced tab in Internet Options. Your help would be appreciated.

Thanks.