You have installed the game with Pinnacle turned off right? With all the things you are saying it screams the game isn't fully installed or needs to be reinstalled.
i tried to install it without pinnacle and I couldn't get the disk to spin and neither could i in pinnacle. I don't know if it is installed or not but as I said before, I can't get the disk to spin so that I can run oblivion and install or uninstall it. usually there is a program in my computer/my programs called Bethesda or oblivion and it's not there so I have no way to uninstall or install the game, or so it seems.
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