I'm using IE Version 8 and when I try to open PDFs in my browser, it hangs...then eventually gives me an error saying "There is a problem With Adobe / Acrobat Reader. Please exit Adobe Acrobat / Reader and Try again."
An example are the PDF downloads on this site: doratexas.com
I don't have any problem opening them with Firefox.
I have CS4 Design Premium installed and Acrobat 9 Reader installed as well.