Possible to detect prohibited graphics hardware acceleration

>I read in a lot of places that disabling the graphics hardware acceleration
> might be forbidden with Windows Vista.
> I also have a computer/graphics card like this: the slider/option in
> "Troubleshooting" is missing and it says changing this setting is
> forbidden
> by the driver.
>
> My question: How can I detect programmatically that disabling the hardware
> acceleration is prohibited?
>
> This is useful for hiding the respective option in our software in this
> case.
>
> Thank you in advance
> Ulrich