Maybe this will help:
http://support.microsoft.com/kb/191660
Note this section in the KB article:
Method 1: Configure Hardware Acceleration to use the Full setting
Downgrading DirectX is not an option, nor would it be a solution. DirectX
10 is backward compatible, so to speak.
http://www.gamesforwindows.com/en-US...DirectX10.aspx
"Chingy42007" <Chingy42007@discussions.microsoft.com> wrote in message
news:22B6826C-117C-43F3-9C91-2656E1BF3578@microsoft.com...
> I'm trying to enable DirectDraw hardware acceleration, but to no avail. I
> cannot seem to enable it. Can anyone help me out?
>
> Or can someone tell me how to make DirectX 9 my default DirectX version
> instead of 10?
>
> Also, I have Vista Ultimate.
>
> Cheers,
> --Chingy42007--