I have the same issue
I am using Vista after installing Reader 9.0 it takes over
It changes all of my MS office 2007 icons to look like Acrobat icons and then tries to launch adobe instead of my office application such as my outlook I get the following error message
This file does not have a program associated with it for performing this action. Create an association in the set associations control panel"
Please help!!!! I have checked all the associations and they are correct.