I am trying Acrobat X pro free trial version. However, setup could not be completed as there was a message that setup cannot uninstall Acobat 9 Pro previously installed. I have tried a number of uninstallers but had no success. Some of the app could not even detect the existing patch of the remaining Acobat 9.
What is your operating system? If Windows, try http://labs.adobe.com/downloads/acrobatcleaner.html