Acrobat 9 reader error, please install acrobat 8 or 9 when opening pdf file

This is a new error I came across after upgrading from acrobat reader 8 to 9.

Solution:
In order for pdf's to open with Internet Explorer 7 installed you need to open Acrobat reader 9, go to Edit, Preferences, select Internet, then uncheck "open pdf in browser" and "allow fast web view. Close acrobat and all is good.