Pro Tools 8 can't find M-Audio hardware

[JeffVale]

I know this issue has been discussed quite a bit in the past, but I have tried all of the suggested solutions from this forum, as well as what I could find from a pure Google search.

Here are the details: I have created a new Vista box so as to be able to run the older version of Pro Tools (Pro Tools 8 M-Powered). All of the drivers are up to date, not to mention the latest PT 8 update, and I have the Vista SP 2 in place as well. The only device I want Pro Tools to recognize is my Oxygen 25 midi controller. I have the latest drivers for it and Vista recognizes it fine.

There are no other audio devices save for the Realtek on board audio, and I have verified that is the default output device. Does version 8 of PT not know how to work with the Oxygen 25 controller? I'm running out of ideas as to what else this might be caused by.