Hi geek55,
I played with this a while ago and had no problems. But in the past I have had a lot of troubles with the Oracle dll and while trying to find out what was wrong I found this nice little tool.
http://www.dependencywalker.com/
What it does is check all of the references within a dll and makes sure they can be found e.g. wrong oracle installation.
This might help you but I'm not sure. Give it a try.
If not the only other thing that comes to mind is have you turned on the extension in the php.ini.
Nick