Error message from Canvas Planner V4 : The .Net Framework Data Providers require Microsoft Data Access Components(MDAC). Please install Microsoft Data Access Components(MDAC) version 2.6 or later.
The solution to preventing this problem turns out to be a very simple configuration setting in IIS7's Application Pool Advanced Settings.
To fix this problem, all you need to do is enable profile loading in IIS. What this does is tell IIS to completely load the user profile for the entirety of the execution of the application.