I've switched between the Nvidia Inspector setting given here, and the default, global profile, and I see no difference at all (I've applied the changes).
Does applying the default setting to both the specific game profile, and changing the active profile to the default global one effectively remove those settings from the driver, allowing you to start anew?
I previous did NOT have the DX1? field activated and after doing that I noticed that DX was installed as Steam was booting the game up (I launched it from the .exe though), but the graphics look no different.
I've got the latest version of Inspector, and the latest Nvidia drivers.
EDIT: I DID get the little bit of the environment showing through the black bars in cutscenes though so something must have been activated.
Perhaps I'm confusing my screens with the downsampled images that often get posted here.